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2, 5, 257, 46657, 16777217, 10000000001, 8916100448257, 11112006825558017, 18446744073709551617, 39346408075296537575425, 104857600000000000000000001
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,1
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COMMENTS
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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
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LINKS
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PROG
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(PARI) forstep(x=0, 20, 2, print1(x^x+1" "))
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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