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Search: id:A016047
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| A016047 |
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Smallest prime factor of Mersenne numbers. |
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+0
11
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| 3, 7, 31, 127, 23, 8191, 131071, 524287, 47, 233, 2147483647, 223, 13367, 431, 2351, 6361, 179951, 2305843009213693951, 193707721, 228479, 439, 2687, 167, 618970019642690137449562111, 11447, 7432339208719, 2550183799
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..95 (derived from Brillhart et al.)
C. K. Caldwell, Mersenne Primes
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MATHEMATICA
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a = {}; Do[If[PrimeQ[n], w = 2^n - 1; c = FactorInteger[w]; b = c[[1]][[1]]; AppendTo[a, b]], {n, 2, 100}]; a - Artur Jasinski (grafix(AT)csl.pl), Dec 11 2007
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CROSSREFS
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Cf. A003260, A046800
Sequence in context: A061095 A103901 A089162 this_sequence A003260 A138865 A051281
Adjacent sequences: A016044 A016045 A016046 this_sequence A016048 A016049 A016050
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KEYWORD
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nonn
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com)
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