A013599 a(n) = nextprime(5^n) - 5^n.

1, 2, 4, 2, 6, 12, 4, 12, 22, 26, 4, 14, 58, 6, 12, 42, 24, 2, 12, 56, 48, 24, 18, 38, 58, 14, 12, 38, 34, 62, 28, 92, 214, 122, 102, 168, 136, 18, 48, 102, 108, 126, 18, 126, 76, 108, 22, 204, 52, 122, 96, 114, 94, 14, 52, 38, 58, 248, 64, 56, 16, 102, 106

Offset: 0

Author

James Kilfiger (mapdn(AT)csv.warwick.ac.uk)

Keywords

• nonn

Links

• Zak Seidov, Table of n, a(n) for n = 0..500

Crossrefs

Cf. A000351, A013632, A054321, A151800,

Programs

Maple

seq(nextprime(5^i)-5^i, i=0..100);

Mathematica

NextPrime[#]-#&/@(5^Range[0,70]) (* Harvey P. Dale, Sep 29 2011 *)

PARI

a(n) = nextprime(5^n+1) - 5^n; \\ Michel Marcus, Jun 14 2020

Formula

a(n) = A151800(5^n)-5^n = A054321(n)-5^n = A013632(5^n). - R. J. Mathar, Nov 28 2016