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Search: id:A152219
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| A152219 |
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Numbers n such that n! - 1 is divisible by a square. |
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2
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OFFSET
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1,1
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COMMENT
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Primes p such that p^2 divides m!-1 for some integer m<p see A152220.
a(6)=4929 [From Artur Jasinski (grafix(AT)csl.pl), Nov 30 2008]
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MATHEMATICA
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aa = {}; Do[If[(Sqrt[n! - 1] /. Sqrt[_] -> 1) > 1, Print[n]; AppendTo[aa, n], {n, 1, 1000}]; aa (*Artur Jasinski*)
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CROSSREFS
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A064237
Sequence in context: A043917 A037378 A100663 this_sequence A029712 A136353 A136354
Adjacent sequences: A152216 A152217 A152218 this_sequence A152220 A152221 A152222
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KEYWORD
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nonn
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AUTHOR
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Artur Jasinski (grafix(AT)csl.pl), Nov 29 2008
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