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A079324
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k such that 2kp+1 is the first factor of a nonprime Mersenne number M(p) = 2^p - 1.
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1
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1, 1, 4, 3, 163, 5, 25, 60, 1525, 1445580, 1609, 3, 17, 1, 59, 36793758459
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OFFSET
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0,3
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LINKS
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Table of n, a(n) for n=0..15.
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EXAMPLE
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2^11-1=23.89, 23=2.1.11+1, therefore a(1)=1.
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PROG
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(PARI) forprime (n=3, 101, v=2^n-1; if (!isprime(v), print1((factor(v)[, 1][1]-1)\(2*n)", ")))
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CROSSREFS
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Cf. A054723.
Sequence in context: A016504 A013335 A220556 * A002298 A195565 A197243
Adjacent sequences: A079321 A079322 A079323 * A079325 A079326 A079327
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KEYWORD
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nonn
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AUTHOR
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Jon Perry, Feb 12 2003
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STATUS
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approved
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