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a(n) = nextprime(3^n)-3^n.
8

%I #12 Nov 28 2016 05:13:19

%S 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,

%T 26,130,4,16,70,70,34,22,2,50,8,82,118,70,4,52,8,46,68,52,56,16,28,34,

%U 50,26,28,20,62,4,158,64,16,34,122,2,92,64,28,230,20

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

%H Zak Seidov, <a href="/A013598/b013598.txt">Table of n, a(n) for n = 0..1000</a>

%F a(n) = A151800(3^n)-3^n = A013632(3^n). - _R. J. Mathar_, Nov 28 2016

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

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

%Y Cf. A013604.

%K nonn

%O 0,2

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

%E Corrected by _Harvey P. Dale_, Jul 14 2014