A013598 - OEIS

A013598

a(n) = nextprime(3^n)-3^n.

1, 2, 2, 2, 2, 8, 4, 16, 2, 4, 2, 20, 16, 8, 2, 2, 26, 34, 10, 56, 8, 56, 4, 32, 2, 14, 2, 16, 26, 130, 4, 16, 70, 70, 34, 22, 2, 50, 8, 82, 118, 70, 4, 52, 8, 46, 68, 52, 56, 16, 28, 34, 50, 26, 28, 20, 62, 4, 158, 64, 16, 34, 122, 2, 92, 64, 28, 230, 20

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,2

LINKS

Zak Seidov, Table of n, a(n) for n = 0..1000

FORMULA

a(n) = A151800(3^n)-3^n = A013632(3^n). - R. J. Mathar, Nov 28 2016

MAPLE

seq(nextprime(3^i)-3^i, i=0..100);

MATHEMATICA

np[n_]:=Module[{c=3^n}, NextPrime[c]-c]; Array[np, 80, 0] (* Harvey P. Dale, Jul 14 2014 *)

CROSSREFS