A013601 a(n) = nextprime(7^n)-7^n.

1, 4, 4, 4, 10, 4, 10, 4, 16, 4, 18, 10, 16, 40, 4, 66, 6, 24, 48, 24, 16, 52, 102, 4, 46, 60, 10, 24, 76, 10, 114, 18, 90, 40, 24, 36, 6, 72, 22, 24, 232, 10, 54, 60, 216, 160, 174, 34, 48, 24, 382, 88, 48, 10, 124, 10, 58, 34, 132, 214, 46, 22, 40, 136

Offset: 0

Author

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

Keywords

• nonn

Links

• Daniel Starodubtsev, Table of n, a(n) for n = 0..1000

Crossrefs

Cf. A013632, A063767.

Programs

Maple

seq(nextprime(7^i)-7^i,i=0..100);

PARI

a(n) = nextprime(7^n+1) - 7^n; \\ Michel Marcus, Aug 13 2019

Formula

a(n) = A063767(n)-7^n = A013632(7^n). - R. J. Mathar, Nov 28 2016