OFFSET
1,2
COMMENTS
n such that a(n) is divisible by a square > 1: 4, 15, 22, 27, ...
EXAMPLE
a(2) = 5 because (2^(2*2) - (2-1)^(2*2))/(2*2-1) = 5.
PROG
(Magma) [(n^(2*n) - (n-1)^(2*n))/(2*n-1): n in [1..15]];
CROSSREFS
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Jan 03 2017
STATUS
approved