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A136030
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Smallest prime factor of composite Mersenne numbers.
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6
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23, 47, 233, 223, 13367, 431, 2351, 6361, 179951, 193707721, 228479, 439, 2687, 167, 11447, 7432339208719, 2550183799, 745988807, 3391, 263, 32032215596496435569, 5625767248687, 86656268566282183151, 18121, 852133201, 150287, 2349023, 730753, 359, 43441, 383
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internal format)
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OFFSET
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1,1
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LINKS
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Charles R Greathouse IV, Table of n, a(n) for n = 1..150
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MATHEMATICA
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a = {}; Do[If[PrimeQ[n] && !PrimeQ[2^n - 1], w = 2^n - 1; c = FactorInteger[w]; b = c[[1]][[1]]; AppendTo[a, b]], {n, 2, 130}]; a
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PROG
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(PARI) lista() = {vi = readvec("c:/gp/bfiles/b054723.txt"); vm = vector(#vi, i, 2^vi[i]-1); for (i=1, #vm, print1(factor(vm[i])[1, 1], ", "); ); } \\ Michel Marcus, May 14 2014
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CROSSREFS
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Cf. A049479, A016047.
Sequence in context: A065017 A140618 A042052 * A054693 A180945 A052229
Adjacent sequences: A136027 A136028 A136029 * A136031 A136032 A136033
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KEYWORD
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nonn
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AUTHOR
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Artur Jasinski, Dec 11 2007
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EXTENSIONS
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More terms from Michel Marcus, May 14 2014
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STATUS
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approved
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