



2, 5, 257, 46657, 16777217, 10000000001, 8916100448257, 11112006825558017, 18446744073709551617, 39346408075296537575425, 104857600000000000000000001
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OFFSET

0,1


COMMENTS

a(n) is never a perfect square because (2n)^(2n) is a positive square and the only squares that differ by 1 are 0 and 1. Sierpinski numbers are n^n+1. Hence this sequence is a subset of the Sierpinski numbers (A014566).  T. D. Noe, Mar 31 2006


LINKS



PROG

(PARI) forstep(x=0, 20, 2, print1(x^x+1" "))


CROSSREFS



KEYWORD

easy,nonn


AUTHOR



STATUS

approved



