A010513 -id:A010513 - cp's OEIS frontend

A248285 Egyptian fraction representation of sqrt(60) (A010513) using a greedy function.

7, 2, 5, 22, 1953, 8757320, 200363231947338, 251498638872293007053426171621, 66042587251601360877390227281939923689168739166891158256860, 4700611214316865673372383919277278315652700484280159329574134292008149533706899635266740297016908819979207833123794661

Offset: 0

Robert G. Wilson v, Oct 04 2014

nonn

Cf. A010513 (decimal expansion), A040052 (continued fraction).
Egyptian fraction representations of the square roots: A006487, A224231, A248235-A248322.
Egyptian fraction representations of the cube roots: A129702, A132480-A132574.

Egyptian[nbr_] := Block[{lst = {IntegerPart[nbr]}, cons = N[ FractionalPart[ nbr], 2^20], denom, iter = 8}, While[ iter > 0, denom = Ceiling[ 1/cons]; AppendTo[ lst, denom]; cons -= 1/denom; iter--]; lst]; Egyptian[ Sqrt[ 60]]

A372267 Decimal expansion of the smallest positive zero of the Legendre polynomial of degree 4.

Original entry on oeis.org

3, 3, 9, 9, 8, 1, 0, 4, 3, 5, 8, 4, 8, 5, 6, 2, 6, 4, 8, 0, 2, 6, 6, 5, 7, 5, 9, 1, 0, 3, 2, 4, 4, 6, 8, 7, 2, 0, 0, 5, 7, 5, 8, 6, 9, 7, 7, 0, 9, 1, 4, 3, 5, 2, 5, 9, 2, 9, 5, 3, 9, 7, 6, 8, 2, 1, 0, 2, 0, 0, 3, 0, 4, 6, 3, 2, 3, 7, 0, 3, 4, 4, 7, 7, 8, 7, 5

Offset: 0

Pontus von Brömssen, Apr 25 2024

			0.339981043584856264802665759103244687200575869770914352592953...

Paolo Xausa, Table of n, a(n) for n = 0..10000
M. Abramowitz and I. A. Stegun, eds., Handbook of Mathematical Functions, National Bureau of Standards, Applied Math. Series 55, Tenth Printing, 1972 [alternative scanned copy], Table 25.4, n=4
Wikipedia, Legendre polynomials.
Index entries for algebraic numbers, degree 4.

Cf. A008316, A100258.
There are floor(k/2) positive zeros of the Legendre polynomial of degree k:
   k | zeros
  ---+--------------------------
   2 | A020760
   3 | A010513/10
   4 | A372267, A372268
   5 | A372269, A372270
   6 | A372271, A372272, A372273
   7 | A372274, A372275, A372276

First[RealDigits[Root[LegendreP[4, #] &, 3], 10, 100]] (* Paolo Xausa, Feb 27 2025 *)

Smallest positive root of 35*x^4 - 30*x^2 + 3 = 0.

Equals sqrt((3-2*sqrt(6/5))/7).

A372268 Decimal expansion of the largest positive zero of the Legendre polynomial of degree 4.

Original entry on oeis.org

8, 6, 1, 1, 3, 6, 3, 1, 1, 5, 9, 4, 0, 5, 2, 5, 7, 5, 2, 2, 3, 9, 4, 6, 4, 8, 8, 8, 9, 2, 8, 0, 9, 5, 0, 5, 0, 9, 5, 7, 2, 5, 3, 7, 9, 6, 2, 9, 7, 1, 7, 6, 3, 7, 6, 1, 5, 7, 2, 1, 9, 2, 0, 9, 0, 6, 5, 2, 9, 4, 7, 1, 4, 9, 5, 0, 4, 8, 8, 6, 5, 7, 0, 4, 1, 6, 2

Offset: 0

Pontus von Brömssen, Apr 25 2024

			0.861136311594052575223946488892809505095725379629717637615721...

Paolo Xausa, Table of n, a(n) for n = 0..10000
M. Abramowitz and I. A. Stegun, eds., Handbook of Mathematical Functions, National Bureau of Standards, Applied Math. Series 55, Tenth Printing, 1972 [alternative scanned copy]. Table 25.4, n=4
Wikipedia, Legendre polynomials.
Index entries for algebraic numbers, degree 4.

Cf. A008316, A100258.
There are floor(k/2) positive zeros of the Legendre polynomial of degree k:
   k | zeros
  ---+--------------------------
   2 | A020760
   3 | A010513/10
   4 | A372267, A372268
   5 | A372269, A372270
   6 | A372271, A372272, A372273
   7 | A372274, A372275, A372276

First[RealDigits[Root[LegendreP[4, #] &, 4], 10, 100]] (* Paolo Xausa, Feb 27 2025 *)

Largest positive root of 35*x^4 - 30*x^2 + 3 = 0.

Equals sqrt((3+2*sqrt(6/5))/7).

A372269 Decimal expansion of the smallest positive zero of the Legendre polynomial of degree 5.

Original entry on oeis.org

5, 3, 8, 4, 6, 9, 3, 1, 0, 1, 0, 5, 6, 8, 3, 0, 9, 1, 0, 3, 6, 3, 1, 4, 4, 2, 0, 7, 0, 0, 2, 0, 8, 8, 0, 4, 9, 6, 7, 2, 8, 6, 6, 0, 6, 9, 0, 5, 5, 5, 9, 9, 5, 6, 2, 0, 2, 2, 3, 1, 6, 2, 7, 0, 5, 9, 4, 7, 1, 1, 8, 5, 3, 6, 7, 7, 5, 5, 2, 9, 1, 0, 3, 5, 8, 0, 3

Offset: 0

Pontus von Brömssen, Apr 25 2024

			0.538469310105683091036314420700208804967286606905559956202231...

Paolo Xausa, Table of n, a(n) for n = 0..10000
Wikipedia, Legendre polynomials.
Index entries for algebraic numbers, degree 4.

Cf. A008316, A100258.
There are floor(k/2) positive zeros of the Legendre polynomial of degree k:
   k | zeros
  ---+--------------------------
   2 | A020760
   3 | A010513/10
   4 | A372267, A372268
   5 | A372269, A372270
   6 | A372271, A372272, A372273
   7 | A372274, A372275, A372276

First[RealDigits[Root[LegendreP[5, #] &, 4], 10, 100]] (* Paolo Xausa, Feb 27 2025 *)

Smallest positive root of 63*x^4 - 70*x^2 + 15 = 0.

Equals sqrt(5-2*sqrt(10/7))/3.

A372270 Decimal expansion of the largest positive zero of the Legendre polynomial of degree 5.

Original entry on oeis.org

9, 0, 6, 1, 7, 9, 8, 4, 5, 9, 3, 8, 6, 6, 3, 9, 9, 2, 7, 9, 7, 6, 2, 6, 8, 7, 8, 2, 9, 9, 3, 9, 2, 9, 6, 5, 1, 2, 5, 6, 5, 1, 9, 1, 0, 7, 6, 2, 5, 3, 0, 8, 6, 2, 8, 7, 3, 7, 6, 2, 2, 8, 6, 5, 4, 3, 7, 7, 0, 7, 9, 4, 9, 1, 6, 6, 8, 6, 8, 4, 6, 9, 4, 1, 1, 4, 2

Offset: 0

Pontus von Brömssen, Apr 25 2024

			0.906179845938663992797626878299392965125651910762530862873762...

Paolo Xausa, Table of n, a(n) for n = 0..10000
Wikipedia, Legendre polynomials.
Index entries for algebraic numbers, degree 4.

Cf. A008316, A100258.
There are floor(k/2) positive zeros of the Legendre polynomial of degree k:
   k | zeros
  ---+--------------------------
   2 | A020760
   3 | A010513/10
   4 | A372267, A372268
   5 | A372269, A372270
   6 | A372271, A372272, A372273
   7 | A372274, A372275, A372276

First[RealDigits[Root[LegendreP[5, #] &, 5], 10, 100]] (* Paolo Xausa, Feb 27 2025 *)

Largest positive root of 63*x^4 - 70*x^2 + 15 = 0.

Equals sqrt(5+2*sqrt(10/7))/3.

A372271 Decimal expansion of the smallest positive zero of the Legendre polynomial of degree 6.

Original entry on oeis.org

2, 3, 8, 6, 1, 9, 1, 8, 6, 0, 8, 3, 1, 9, 6, 9, 0, 8, 6, 3, 0, 5, 0, 1, 7, 2, 1, 6, 8, 0, 7, 1, 1, 9, 3, 5, 4, 1, 8, 6, 1, 0, 6, 3, 0, 1, 4, 0, 0, 2, 1, 3, 5, 0, 1, 8, 1, 3, 9, 5, 1, 6, 4, 5, 7, 4, 2, 7, 4, 9, 3, 4, 2, 7, 5, 6, 3, 9, 8, 4, 2, 2, 4, 9, 2, 2, 4

Offset: 0

Pontus von Brömssen, Apr 25 2024

			0.238619186083196908630501721680711935418610630140021350181395...

Paolo Xausa, Table of n, a(n) for n = 0..10000
Wikipedia, Legendre polynomials.
Index entries for algebraic numbers, degree 6.

Cf. A008316, A100258.
There are floor(k/2) positive zeros of the Legendre polynomial of degree k:
   k | zeros
  ---+--------------------------
   2 | A020760
   3 | A010513/10
   4 | A372267, A372268
   5 | A372269, A372270
   6 | A372271, A372272, A372273
   7 | A372274, A372275, A372276

First[RealDigits[Root[LegendreP[6, #] &, 4], 10, 100]] (* Paolo Xausa, Feb 27 2025 *)

Smallest positive root of 231*x^6 - 315*x^4 + 105*x^2 - 5 = 0.

A372272 Decimal expansion of the middle positive zero of the Legendre polynomial of degree 6.

Original entry on oeis.org

6, 6, 1, 2, 0, 9, 3, 8, 6, 4, 6, 6, 2, 6, 4, 5, 1, 3, 6, 6, 1, 3, 9, 9, 5, 9, 5, 0, 1, 9, 9, 0, 5, 3, 4, 7, 0, 0, 6, 4, 4, 8, 5, 6, 4, 3, 9, 5, 1, 7, 0, 0, 7, 0, 8, 1, 4, 5, 2, 6, 7, 0, 5, 8, 5, 2, 1, 8, 3, 4, 9, 6, 6, 0, 7, 1, 4, 3, 1, 0, 0, 9, 4, 4, 2, 8, 6

Offset: 0

Pontus von Brömssen, Apr 25 2024

			0.661209386466264513661399595019905347006448564395170070814526...

Paolo Xausa, Table of n, a(n) for n = 0..10000
Wikipedia, Legendre polynomials.
Index entries for algebraic numbers, degree 6.

Cf. A008316, A100258.
There are floor(k/2) positive zeros of the Legendre polynomial of degree k:
   k | zeros
  ---+--------------------------
   2 | A020760
   3 | A010513/10
   4 | A372267, A372268
   5 | A372269, A372270
   6 | A372271, A372272, A372273
   7 | A372274, A372275, A372276

First[RealDigits[Root[LegendreP[6, #] &, 5], 10, 100]] (* Paolo Xausa, Feb 27 2025 *)

Middle positive root of 231*x^6 - 315*x^4 + 105*x^2 - 5 = 0.

A372273 Decimal expansion of the largest positive zero of the Legendre polynomial of degree 6.

Original entry on oeis.org

9, 3, 2, 4, 6, 9, 5, 1, 4, 2, 0, 3, 1, 5, 2, 0, 2, 7, 8, 1, 2, 3, 0, 1, 5, 5, 4, 4, 9, 3, 9, 9, 4, 6, 0, 9, 1, 3, 4, 7, 6, 5, 7, 3, 7, 7, 1, 2, 2, 8, 9, 8, 2, 4, 8, 7, 2, 5, 4, 9, 6, 1, 6, 5, 2, 6, 6, 1, 3, 5, 0, 0, 8, 4, 4, 2, 0, 0, 1, 9, 6, 2, 7, 6, 2, 8, 8

Offset: 0

Pontus von Brömssen, Apr 25 2024

			0.932469514203152027812301554493994609134765737712289824872549...

Paolo Xausa, Table of n, a(n) for n = 0..10000
Wikipedia, Legendre polynomials.
Index entries for algebraic numbers, degree 6.

Cf. A008316, A100258.
There are floor(k/2) positive zeros of the Legendre polynomial of degree k:
   k | zeros
  ---+--------------------------
   2 | A020760
   3 | A010513/10
   4 | A372267, A372268
   5 | A372269, A372270
   6 | A372271, A372272, A372273
   7 | A372274, A372275, A372276

First[RealDigits[Root[LegendreP[6, #] &, 6], 10, 100]] (* Paolo Xausa, Feb 27 2025 *)

Largest positive root of 231*x^6 - 315*x^4 + 105*x^2 - 5 = 0.

A372274 Decimal expansion of the smallest positive zero of the Legendre polynomial of degree 7.

Original entry on oeis.org

4, 0, 5, 8, 4, 5, 1, 5, 1, 3, 7, 7, 3, 9, 7, 1, 6, 6, 9, 0, 6, 6, 0, 6, 4, 1, 2, 0, 7, 6, 9, 6, 1, 4, 6, 3, 3, 4, 7, 3, 8, 2, 0, 1, 4, 0, 9, 9, 3, 7, 0, 1, 2, 6, 3, 8, 7, 0, 4, 3, 2, 5, 1, 7, 9, 4, 6, 6, 3, 8, 1, 3, 2, 2, 6, 1, 2, 5, 6, 5, 5, 3, 2, 8, 3, 1, 2

Offset: 0

Pontus von Brömssen, Apr 25 2024

			0.405845151377397166906606412076961463347382014099370126387043...

Paolo Xausa, Table of n, a(n) for n = 0..10000
M. Abramowitz and I. A. Stegun, eds., Handbook of Mathematical Functions, National Bureau of Standards, Applied Math. Series 55, Tenth Printing, 1972 [alternative scanned copy]. Table 25.4, n=7.
A.H.M. Smeets, Python program for Legendre-Gauss quadrature constants.
Eric Weisstein's World of Mathematics, Legendre Polynomial.
Eric Weisstein's World of Mathematics, Legendre-Gauss Quadrature.
Wikipedia, Legendre polynomials.
Index entries for algebraic numbers, degree 6.

Cf. A008316, A100258.
There are floor(k/2) positive zeros of the Legendre polynomial of degree k:
   k | zeros                           | corresponding weights for Legendre-Gauss quadrature
  ---+---------------------------------+----------------------------------------------------
   2 | A020760                         | A000007*10
   3 | A010513/10                      | A010716
   4 | A372267, A372268                | A382103, A382104
   5 | A372269, A372270                | A382105, A382106
   6 | A372271, A372272, A372273       | A382107, A382686, A382687
   7 | this sequence, A372275, A372276 | A382688, A382689, A382690

First[RealDigits[Root[LegendreP[7, #] &, 5], 10, 100]] (* Paolo Xausa, Feb 27 2025 *)

solve (x = 0.1, 0.5, 429*x^6 - 693*x^4 + 315*x^2 - 35) \\ A.H.M. Smeets, May 31 2025

Smallest positive root of 429*x^6 - 693*x^4 + 315*x^2 - 35 = 0.

A372275 Decimal expansion of the middle positive zero of the Legendre polynomial of degree 7.

Original entry on oeis.org

7, 4, 1, 5, 3, 1, 1, 8, 5, 5, 9, 9, 3, 9, 4, 4, 3, 9, 8, 6, 3, 8, 6, 4, 7, 7, 3, 2, 8, 0, 7, 8, 8, 4, 0, 7, 0, 7, 4, 1, 4, 7, 6, 4, 7, 1, 4, 1, 3, 9, 0, 2, 6, 0, 1, 1, 9, 9, 5, 5, 3, 5, 1, 9, 6, 7, 4, 2, 9, 8, 7, 4, 6, 7, 2, 1, 8, 0, 5, 1, 3, 7, 9, 2, 8, 2, 6

Offset: 0

Pontus von Brömssen, Apr 25 2024

			0.741531185599394439863864773280788407074147647141390260119955...

Paolo Xausa, Table of n, a(n) for n = 0..10000
M. Abramowitz and I. A. Stegun, eds., Handbook of Mathematical Functions, National Bureau of Standards, Applied Math. Series 55, Tenth Printing, 1972 [alternative scanned copy]. Table 25.4, n=7.
A.H.M. Smeets, Python program for Legendre-Gauss quadrature constants.
Eric Weisstein's World of Mathematics, Legendre Polynomial.
Eric Weisstein's World of Mathematics, Legendre-Gauss Quadrature.
Wikipedia, Legendre polynomials.
Index entries for algebraic numbers, degree 6.

Cf. A008316, A100258.
There are floor(k/2) positive zeros of the Legendre polynomial of degree k:
   k | zeros                           | corresponding weights for Legendre-Gauss quadrature
  ---+---------------------------------+----------------------------------------------------
   2 | A020760                         | A000007*10
   3 | A010513/10                      | A010716
   4 | A372267, A372268                | A382103, A382104
   5 | A372269, A372270                | A382105, A382106
   6 | A372271, A372272, A372273       | A382107, A382686, A382687
   7 | A372274, this sequence, A372276 | A382688, A382689, A382690

First[RealDigits[Root[LegendreP[7, #] &, 6], 10, 100]] (* Paolo Xausa, Feb 27 2025 *)

solve (x = 0.6, 0.8, 429*x^6 - 693*x^4 + 315*x^2 - 35) \\ A.H.M. Smeets, May 31 2025

Middle positive root of 429*x^6 - 693*x^4 + 315*x^2 - 35 = 0.

cp's OEIS Frontend

A248285 Egyptian fraction representation of sqrt(60) (A010513) using a greedy function.

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A372267 Decimal expansion of the smallest positive zero of the Legendre polynomial of degree 4.

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A372268 Decimal expansion of the largest positive zero of the Legendre polynomial of degree 4.

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A372269 Decimal expansion of the smallest positive zero of the Legendre polynomial of degree 5.

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A372270 Decimal expansion of the largest positive zero of the Legendre polynomial of degree 5.

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A372271 Decimal expansion of the smallest positive zero of the Legendre polynomial of degree 6.

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A372272 Decimal expansion of the middle positive zero of the Legendre polynomial of degree 6.

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Keywords

Examples

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Programs

Mathematica

Formula

A372273 Decimal expansion of the largest positive zero of the Legendre polynomial of degree 6.

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Author

Keywords

Examples

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Programs

Mathematica

Formula

A372274 Decimal expansion of the smallest positive zero of the Legendre polynomial of degree 7.

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