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Search: id:A081216
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| 0, 1, 1, 7, 51, 521, 6665, 102943, 1864135, 38742049, 909090909, 23775972551, 685853880635, 21633936185161, 740800455037201, 27368368148803711, 1085102592571150095, 45957792327018709121, 2070863582910344082917
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OFFSET
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0,4
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COMMENT
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a(n) is prime for n = {3, 5, 17, 157} = A056826(n) Primes p such that (p^p + 1)/(p + 1) is a prime. Prime a(n) are {7, 521, 45957792327018709121, ...}. Bisection of a(n) is Sierpinski quotent a(2n-1) = A124899(n) = (2n-1)^(2n-1) + 1)/(2n) = A014566(2n-1)/(2n). - Alexander Adamchuk (alex(AT)kolmogorov.com), Nov 12 2006
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CROSSREFS
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Cf. A056826, A124899, A014566 - Sierpinski numbers of the first kind: n^n + 1.
Sequence in context: A137382 A104454 A019472 this_sequence A124271 A138849 A057675
Adjacent sequences: A081213 A081214 A081215 this_sequence A081217 A081218 A081219
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KEYWORD
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easy,nonn
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AUTHOR
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Vladeta Jovovic (vladeta(AT)Eunet.yu), Apr 17 2003
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