OFFSET
1,1
COMMENTS
Numbers n such that (2^n + 3^n)/13 is prime are listed in A181628 = {6, 10, 14, 22, 34, 38, 82, 106, 218, 334, 4414 , ...}.
EXAMPLE
4621 is in the sequence because (2^10+ 3^10)/13 = 60073/13 = 4621 is
prime.
MAPLE
with(numtheory):for n from 1 to 350 do: x:= (2^n + 3^n)/13:if floor(x)=x and
type(x, prime)=true then printf(`%d, `, x):else fi:od:
CROSSREFS
KEYWORD
nonn
AUTHOR
Michel Lagneau, Nov 18 2010
STATUS
approved