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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A021387 Decimal expansion of 1/383.

Original entry on oeis.org

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

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Author

N. J. A. Sloane

Keywords

Comments

The magic square that uses the decimals of 1/383 is fully magic. 19 has the same property (see A021023). For other such primes see A072359. - Michel Marcus, Sep 02 2015

Links

Crossrefs

Cf. A021023, A072359.

Programs

  • Mathematica
    x = RealDigits[N[1/383, 120]]; Table[0, {Abs@ Last@ x}]~Join~First@ x (* Michael De Vlieger, Sep 02 2015 *)
realDigitsRecip[383] (* The realDigitsRecip program is at A021200 *) (* Harvey P. Dale, Aug 07 2025 *)
  • PARI
    default(realprecision,2000);1/383.0 \\ Anders Hellström, Sep 02 2015

A020791 Decimal expansion of 1/sqrt(34).

Original entry on oeis.org

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

Views

Author

N. J. A. Sloane

Keywords

Comments

1/sqrt(34) = 0.171498585142508837378651555221928914015335245143705057483823727790229707706... [Vladimir Joseph Stephan Orlovsky, May 31 2010]

Links

Programs

A020801 Decimal expansion of 1/sqrt(44).

Original entry on oeis.org

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

Views

Author

N. J. A. Sloane

Keywords

Comments

1/sqrt(44) = 0.150755672288881811323406033485031212905776752072243345320849188459840211028... [Vladimir Joseph Stephan Orlovsky, Jun 01 2010]

Links

Programs

A020855 Decimal expansion of 1/sqrt(98).

Original entry on oeis.org

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

Views

Author

N. J. A. Sloane

Keywords

Links

Programs

  • Mathematica
    RealDigits[1/Sqrt[98],10,120][[1]] (* Harvey P. Dale, Apr 07 2023 *)
realDigitsRecip[Sqrt[98]] (* The realDigitsRecip program is at A021200 *) (* Harvey P. Dale, Sep 01 2024 *)

A021325 Decimal expansion of 1/321.

Original entry on oeis.org

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

Views

Author

N. J. A. Sloane

Keywords

Comments

Periodic with period 53, the order of 10 modulo 321. - Joerg Arndt, Aug 16 2022

Examples

			0.003115264797507788161993769470404984423676012461059...

Links

Programs

  • Mathematica
    Join[{0,0},RealDigits[1/321,10,120][[1]]] (* Harvey P. Dale, Apr 26 2011 *)
realDigitsRecip[321] (* The realDigitsRecip program is at A021200 *) (* Harvey P. Dale, Jan 30 2025 *)

A021328 Decimal expansion of 1/324.

Original entry on oeis.org

0, 0, 3, 0, 8, 6, 4, 1, 9, 7, 5, 3, 0, 8, 6, 4, 1, 9, 7, 5, 3, 0, 8, 6, 4, 1, 9, 7, 5, 3, 0, 8, 6, 4, 1, 9, 7, 5, 3, 0, 8, 6, 4, 1, 9, 7, 5, 3, 0, 8, 6, 4, 1, 9, 7, 5, 3, 0, 8, 6, 4, 1, 9, 7, 5, 3, 0, 8, 6, 4, 1, 9, 7, 5, 3, 0, 8, 6, 4, 1, 9, 7, 5, 3, 0, 8, 6, 4, 1, 9, 7, 5, 3, 0, 8, 6, 4, 1, 9
Offset: 0

Views

Author

N. J. A. Sloane

Keywords

Comments

The nominal length of 1 second of latitude is 10000/324 m, that is 30.86419753086419753... m. - Jean-François Alcover, Mar 10 2015

Examples

			0.00308641975308641975308641975308641975...

Links

Programs

  • Mathematica
    PadLeft[First@#, Abs@Last@# + Length@First@#]&@RealDigits[N[1/324, 100]] (* Vincenzo Librandi, Jun 22 2016 *)
realDigitsRecip[324] (* The realDigitsRecip program is at A021200 *) (* or *)  PadRight[{0,0},120,{7,5,3,0,8,6,4,1,9}] (* Harvey P. Dale, Aug 04 2025 *)

Formula

G.f.: x^2*(5*x^8 + 7*x^7 + 9*x^6 + x^5 + 4*x^4 + 6*x^3 + 8*x^2 + 3)/(1 - x^9). - Chai Wah Wu, Jun 21 2016

A021687 Decimal expansion of 1/683.

Original entry on oeis.org

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

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Author

N. J. A. Sloane

Keywords

Comments

Radiant intensity in any given direction, expressed in W/sr (Watts per steradian), of a luminous source with the frequency 540*10^12 Hz, corresponding to 1 cd (candela). Defined and fixed in 1979 by the 16th CPGM. - Stanislav Sykora, Mar 30 2015

Examples

			0.0014641288433382137628111273792...

Links

Programs

  • Mathematica
    d = RealDigits@ N[1/683, 120]; PadLeft[First@ d, Length@ First@ d + Abs@ Last@ d] (* Michael De Vlieger, Mar 30 2015 *)
realDigitsRecip[683] (* The realDigitsRecip program is at A021200 *) (* Harvey P. Dale, Nov 01 2024 *)
  • PARI
    1/683.0 \\ Michel Marcus, Mar 31 2015

A021785 Decimal expansion of 1/781.

Original entry on oeis.org

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

Views

Author

N. J. A. Sloane

Keywords

Programs

  • Mathematica
    realDigitsRecip[781] (* The realDigitsRecip program is at A021200 *) (* Harvey P. Dale, Oct 22 2024 *)

A021892 Decimal expansion of 1/888.

Original entry on oeis.org

0, 0, 1, 1, 2, 6, 1, 2, 6, 1, 2, 6, 1, 2, 6, 1, 2, 6, 1, 2, 6, 1, 2, 6, 1, 2, 6, 1, 2, 6, 1, 2, 6, 1, 2, 6, 1, 2, 6, 1, 2, 6, 1, 2, 6, 1, 2, 6, 1, 2, 6, 1, 2, 6, 1, 2, 6, 1, 2, 6, 1, 2, 6, 1, 2, 6, 1, 2, 6, 1, 2, 6, 1, 2, 6, 1, 2, 6, 1, 2, 6, 1, 2, 6, 1, 2, 6, 1, 2, 6, 1, 2, 6, 1, 2, 6, 1, 2, 6
Offset: 0

Views

Author

N. J. A. Sloane

Keywords

Examples

			0.001126126126126126... - _David A. Corneth_, Oct 01 2017

Links

Programs

  • Mathematica
    realDigitsRecip[888] (* The realDigitsRecip program is at A021200 *)  (* or *) PadRight[{0,0,1},120,{1,2,6}] (* Harvey P. Dale, Oct 04 2024 *)
  • PARI
    a(n) = if(n<=2, (n+1)\3, (1+n%3)!) \\ David A. Corneth, Oct 01 2017

A021126 Decimal expansion of 1/122.

Original entry on oeis.org

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

Views

Author

N. J. A. Sloane

Keywords

Programs

  • Mathematica
    realDigitsRecip[122] (* The realDigitsRecip program is at A021200 *) (* Harvey P. Dale, Aug 30 2024 *)
Previous Showing 11-20 of 74 results. Next

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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