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.

Showing 1-2 of 2 results.

A065815 Numbers n such that initial n digits in decimal portion of the Euler-Mascheroni constant form a prime number.

Original entry on oeis.org

1, 3, 40, 185, 1038, 22610, 179849
Offset: 1

Views

Author

Jason Earls, Dec 06 2001

Keywords

Links

Crossrefs

Cf. A047658, A057563, A001620.

Extensions

a(6) = 22610 from Eric W. Weisstein, Apr 25 2006
a(7) = 179849 from Eric W. Weisstein, Jun 01 2011

A065868 Initial n digits in decimal portion of golden ratio phi (or tau) = (1 + sqrt 5)/2 form a prime number.

Original entry on oeis.org

2, 14, 887, 4267, 5163, 8867, 18644, 24429, 130911
Offset: 1

Views

Author

Jason Earls, Dec 07 2001

Keywords

Comments

887 certified prime with Primo.
Note: the upper bound of 10^6 in this program has not actually been reached, so the next term may occur at any value >8867. - Ryan Propper, Aug 12 2005
Search limit is 200000. - Serge Batalov, Jun 21 2017

Crossrefs

Cf. A047658, A057563, A001622.

Programs

  • Mathematica
    phi = First@ RealDigits[N[GoldenRatio - 1, 10^6 + 1]]; Do[k = FromDigits[Take[phi, n]]; If[PrimeQ[k], Print[n]], {n, 1, 10^6}] (* Ryan Propper, Aug 12 2005, edited by Michael De Vlieger, Jun 21 2017 *)

Extensions

a(4)-a(6) from Ryan Propper, Aug 12 2005
a(7)-a(9) from Serge Batalov, Jun 21 2017
Showing 1-2 of 2 results.

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