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Search: id:A129219
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| A129219 |
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Residues of the Lucas - Lehmer primality test for M(7) = 127. |
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+0
8
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OFFSET
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0,1
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COMMENT
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Since a(5) = 0, M(7) is prime.
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LINKS
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Eric Weisstein's World of Mathematics, Lucas Lehmer Test.
Wikipedia, Lucas Lehmer Primality Test).
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FORMULA
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a(0) = 4 a(n) = a(n-1)^2 mod 2^p-1 Last term: a(p-2)
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EXAMPLE
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a(5)= 111^2 - 2 mod 127 = 0
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CROSSREFS
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Cf. A095847, A003010, A129220, A129221, A129222, A129223, A129224, A129225, A129226.
Sequence in context: A081891 A119857 A126787 this_sequence A007025 A014512 A065606
Adjacent sequences: A129216 A129217 A129218 this_sequence A129220 A129221 A129222
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KEYWORD
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fini,full,nonn
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AUTHOR
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Sergio Pimentel (ferdiego(AT)suddenlink.net), Apr 04 2007
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