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Search: id:A121999
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| A121999 |
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Primes p such that p^2 divides Sierpinski number A014566[(p-1)/2]. |
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6
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OFFSET
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1,1
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COMMENT
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A014566[n] = n^n + 1. a(n) is a subset of A003628[n] Primes congruent to {5, 7} mod 8, because prime p divides A014566[(p-1)/2] iff p belong to A003628[n].
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LINKS
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Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics. Sierpinski Number of the First Kind.
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MATHEMATICA
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Do[p=Prime[n]; f=((p-1)/2)^((p-1)/2)+1; If[IntegerQ[f/p^2], Print[p]], {n, 1, 3373}]
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CROSSREFS
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Cf. A014566, A003628.
Sequence in context: A167470 A152865 A108272 this_sequence A069530 A087144 A114616
Adjacent sequences: A121996 A121997 A121998 this_sequence A122000 A122001 A122002
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KEYWORD
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bref,more,nonn
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AUTHOR
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Alexander Adamchuk (alex(AT)kolmogorov.com), Sep 11 2006
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