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.

A105462 The 3^n-th irregular prime.

Original entry on oeis.org

37, 67, 233, 467, 1307, 4637, 15601, 54437, 184279, 616391, 2009011, 6568151, 21341821, 68826689, 220682383, 704456869
Offset: 1

Views

Author

Robert G. Wilson v, Apr 07 2005

Keywords

Crossrefs

Cf. A038833, A105458, A105467.

Programs

  • Mathematica
    ip={ the list of irregular primes to 12 million }; Table[ ip[[3^n]], {n, 0, 11}]

Extensions

a(12) corrected and a(13)-a(17) added by Amiram Eldar, Mar 05 2019

A105467 Number of irregular primes less than or equal to the 3^n-th prime.

Original entry on oeis.org

0, 0, 5, 22, 91, 286, 863, 2577, 7717, 23160, 69939, 209485, 627826, 1881554, 5645226, 16936048
Offset: 1

Views

Author

Robert G. Wilson v, Apr 07 2005

Keywords

Comments

Limit_{n->inf.} a(n)/3^n = 1-e^(-1/2).

Crossrefs

Cf. A038833, A105458, A105462.

Programs

  • Mathematica
    ip={ the list of irregular primes to 12 million }; Table[ Length[ Select[ip, # < Prime[3^n] &]], {n, 9}]

Extensions

Terms corrected and a(10)-a(16) added by Amiram Eldar, Mar 05 2019
Showing 1-2 of 2 results.

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

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