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 1-1 of 1 results.

A290047 Primes in A290046.

Original entry on oeis.org

2, 45181, 6290021506693847759, 25266964023001914822246560759, 10384129888710330539039375199241
Offset: 1

Views

Author

XU Pingya, Jul 19 2017

Keywords

Comments

For n < 26, A290046(n) are primes when n = {1, 4, 11, 15, 16}.
For n >= 26, 41|A290046(n). Therefore there are only 5 terms in this sequence.

Examples

			45181 = |0!! - 3!! + 6!! - 9!! + 12!!| is prime.

Crossrefs

Cf. A006882, A071828, A290046.

Programs

  • Mathematica
    Select[#, PrimeQ] &@ Table[Abs@ Sum[(-1)^k*(3 k)!!, {k, 0, n}], {n, 0, 30}] (* Michael De Vlieger, Jul 19 2017 *)
Showing 1-1 of 1 results.

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

Content is available under The OEIS End-User License Agreement.