cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A164661 Denominators of row sums of triangle of rationals A164658/A164659. Definite integral of Chebyshev polynomials of the first kind: Integral_{x=0..1} T(n,x).

Original entry on oeis.org

1, 2, 3, 2, 15, 6, 35, 6, 63, 10, 99, 10, 143, 14, 195, 14, 255, 18, 323, 18, 399, 22, 483, 22, 575, 26, 675, 26, 783, 30, 899, 30, 1023, 34, 1155, 34, 1295, 38, 1443, 38, 1599, 42, 1763, 42, 1935, 46, 2115, 46, 2303, 50, 2499, 50, 2703, 54, 2915, 54, 3135, 58, 3363, 58, 3599
Offset: 0

Views

Author

Wolfdieter Lang, Oct 16 2009

Keywords

Comments

The numerators are given in A164660.
See the W. Lang link under A164660 for a list of the first rationals.

Examples

			Rationals A164660(n)/a(n) = [1, 1/2, -1/3, -1/2, -1/15, 1/6, -1/35, -1/6, -1/63, 1/10, -1/99, ...].

Links

Formula

a(n) = denominator(Sum_{m=1..n+1} IT(n,m)), n>=0, with IT(n,m):= A164658(n,m)/A164659(n,m) (coefficient triangle from the indefinite integral Integral_{x} T(n,x), n>=0, in lowest terms).

A164660 Numerators of row sums of triangle of rationals A164658/A164659. Definite integral of Chebyshev polynomials of the first kind: Integral_{x=0..1} T(n,x).

Original entry on oeis.org

1, 1, -1, -1, -1, 1, -1, -1, -1, 1, -1, -1, -1, 1, -1, -1, -1, 1, -1, -1, -1, 1, -1, -1, -1, 1, -1, -1, -1, 1, -1, -1, -1, 1, -1, -1, -1, 1, -1, -1, -1, 1, -1, -1, -1, 1, -1, -1, -1, 1, -1, -1, -1, 1, -1, -1, -1, 1, -1, -1, -1, 1, -1, -1, -1, 1, -1, -1, -1, 1, -1, -1, -1, 1, -1, -1, -1, 1, -1, -1, -1, 1, -1, -1, -1, 1, -1, -1, -1, 1, -1, -1, -1, 1, -1, -1, -1, 1, -1, -1, -1
Offset: 0

Views

Author

Wolfdieter Lang, Oct 16 2009

Keywords

Examples

			Rationals a(n)/A164661(n)= [1, 1/2, -1/3, -1/2, -1/15, 1/6, -1/35, -1/6, -1/63, 1/10, -1/99, ...].

Links

Crossrefs

The denominators are given in A164661.
Triangle of int(T(n,x),x) coefficients is A164658/A164659.

Formula

a(n) = numerator(Sum_{m=1..n+1} IT(n,m)), n>=0, with IT(n,m):= A164658(n,m)/A164659(n,m) (coefficient triangle from the indefinite integral Integral_{x} T(n,x), n>=0, in lowest terms).
Conjecture for the rationals r(n):= A164660(n)/A164661(n): r(n)= 1 if n=0, if n is even r(n) = -1/((n-1)*(n+1)) and if n is odd r(n) = ((-1)^((n-1)/2))/(2*(2*floor((n-1)/4)+1)).
a(n+1) = Product_{k=1..n} ( 1-2*(floor(k^n/n)-floor((k^n -1)/n)) ) = (-1)^(A003557(n)) for n>0 (conjecture). - Anthony Browne, May 29 2016

A164662 Row sums of triangle A164658 (numerators of coefficients from Integral_{x} T(n,x), with T(n,x) Chebyshev polynomials of the first kind).

Original entry on oeis.org

1, 1, 1, -2, 1, 8, -11, -41, -127, 107, -639, -1372, -3695, 514, -25983, -26339, -70655, -46299, -430955, -484134, -2808479, 93148, -5032895, -17319181, -72165695, 43371103, -171203135, -378398576, -148383647, -2605023034, -3368133419, 11479942073, -11902375935, 2021161097, -708801692671
Offset: 0

Views

Author

Wolfdieter Lang, Oct 16 2009

Keywords

Comments

The row sums of the rational triangle A164658/A164659 give A164660/A164661.

Links

Crossrefs

Row sums of denominator triangle A164659 gives A164663.

Formula

a(n) = Sum_{m=1..n+1} A164658(n,m), n>=0.

A164659 Denominators of coefficients of integrated Chebyshev polynomials T(n,x) (in increasing order of powers of x).

Original entry on oeis.org

1, 1, 2, 1, 1, 3, 1, 2, 1, 1, 1, 1, 3, 1, 5, 1, 2, 1, 1, 1, 3, 1, 1, 1, 1, 5, 1, 7, 1, 2, 1, 1, 1, 3, 1, 1, 1, 1, 3, 1, 1, 1, 7, 1, 9, 1, 2, 1, 1, 1, 1, 1, 1, 1, 5, 1, 1, 3, 1, 1, 1, 1, 1, 9, 1, 11, 1, 2, 1, 1, 1, 3, 1, 1, 1, 5, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 11, 1, 13, 1, 2, 1, 1, 1, 3, 1, 1, 1, 1, 1, 3, 1
Offset: 0

Views

Author

Wolfdieter Lang, Oct 16 2009

Keywords

Comments

The numerators are given in A164658.
See the W. Lang link in A164658 for this table and the rational table A164658/A164659.

Examples

			Rational table A164658(n,m)/a(n,m) = [1], [0, 1/2], [-1, 0, 2/3], [0, -3/2, 0, 1], [1, 0, -8/3, 0, 8/5],...

Links

Crossrefs

Row sums of this triangle give A164663.
Row sums of rational triangle A164658/A164659 are given in A164660/A164661.

Programs

  • Mathematica
    row[n_] := CoefficientList[Integrate[ChebyshevT[n, x], x], x] // Rest // Denominator; Table[row[n], {n, 0, 13}] // Flatten (* Jean-François Alcover, Oct 06 2016 *)

Formula

a(n,m) = denominator(b(n,m)), with int(T(n,x),x)= sum(b(n,m)*x^m,m=1..n+1), n>=0, where T(n,x) are Chebyshevs polynomials of the first kind.

A164663 Row sums of triangle A164659 (denominators of coefficients from int(T(n,x),x), with T(n,x) Chebyshev polynomials of the first kind).

Original entry on oeis.org

1, 3, 5, 5, 11, 9, 17, 11, 25, 15, 31, 21, 35, 25, 49, 23, 55, 29, 53, 39, 71, 41, 77, 43, 79, 47, 97, 53, 95, 73, 89, 63, 115, 51, 165, 73, 131, 77, 135, 71, 141, 103, 125, 105, 163, 89, 169, 81, 161, 101, 193, 109, 181, 119, 197, 121, 261, 111, 203, 139, 179, 143, 239, 95
Offset: 0

Views

Author

Wolfdieter Lang, Oct 16 2009

Keywords

Comments

The row sums of the rational triangle A164658/A164659 give A164660/A164661.

Links

Crossrefs

Row sums of numerator triangle A164658 gives A164662.

Formula

a(n) = Sum_{m=1..n+1} A164659(n,m), n>=0.
Showing 1-5 of 5 results.

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