id:A079324 - OEIS Search Results

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k such that 2kp+1 is the first factor of a nonprime Mersenne number M(p) = 2^p - 1.

+0
1

1, 1, 4, 3, 163, 5, 25, 60, 1525, 1445580, 1609, 3, 17, 1, 59, 36793758459 (list; graph; listen)

	OFFSET	`0,3`
	EXAMPLE	`2^11-1=23.89, 23=2.1.11+1, therefore a(1)=1.`
	PROGRAM	`(PARI) forprime (n=3, 101, v=2^n-1; if (!isprime(v), print1((factor(v)[, 1][1]-1)\(2*n)", ")))`
	CROSSREFS	`Cf. A054723.` `Sequence in context: A025175 A016504 A013335 this_sequence A002298 A069191 A098445` `Adjacent sequences: A079321 A079322 A079323 this_sequence A079325 A079326 A079327`
	KEYWORD	`nonn`
	AUTHOR	`Jon Perry (perry(AT)globalnet.co.uk), Feb 12 2003`

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Last modified December 1 19:22 EST 2009. Contains 167811 sequences.