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.

A105461 The floor(exp(n))-th irregular prime.

Original entry on oeis.org

37, 59, 149, 389, 809, 2543, 8089, 25301, 76493, 232439, 695407, 2040551, 5993249, 17532407, 50970511, 147468721, 424835869, 1219642051
Offset: 1

Views

Author

Robert G. Wilson v, Apr 07 2005

Keywords

Crossrefs

Cf. A000928, A000149, A055739, A105457, A105466.

Programs

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

Formula

a(n) = A000928(A000149(n)). - Amiram Eldar, Mar 05 2019

Extensions

a(13) corrected and a(14)-a(18) added by Amiram Eldar, Mar 05 2019

A105466 Number of irregular primes less than or equal to the m-th prime, where m = floor(exp(n)).

Original entry on oeis.org

0, 0, 3, 9, 58, 160, 440, 1166, 3202, 8656, 23475, 64194, 174557, 473592, 1286383, 3495241, 9501807, 25833916
Offset: 1

Views

Author

Robert G. Wilson v, Apr 07 2005

Keywords

Comments

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

Crossrefs

Cf. A055739, A105457, A105461.

Programs

  • Mathematica
    ip={ the list of irregular primes to 12 million }; Table[ Length[ Select[ip, # < Prime[Floor[E^n]] &]], {n, 10}]

Extensions

Definition clarified by N. J. A. Sloane, Jan 19 2009
Data corrected and a(11)-a(18) 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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