id:A152099 - OEIS Search Results

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A152099

Semiprimes based on powers of two and prims: a(n)=(2^Prime[n] - 1)*(2^Prime[n] + 1)=2^(2*Prime[n])-1.

+0
2

15, 63, 1023, 16383, 4194303, 67108863, 17179869183, 274877906943, 70368744177663, 288230376151711743, 4611686018427387903, 18889465931478580854783, 4835703278458516698824703 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Idea resulted from seqfan posts by Artur Jasinski (grafix(AT)csl.pl).`
	MATHEMATICA	`Table[(2^Prime[n] - 1)*(2^Prime[n] + 1), {n, 1, 20}]`
	CROSSREFS	`Sequence in context: A104473 A135972 A138104 this_sequence A119496 A044153 A044534` `Adjacent sequences: A152096 A152097 A152098 this_sequence A152100 A152101 A152102`
	KEYWORD	`nonn`
	AUTHOR	`Roger L. Bagula (rlbagulatftn(AT)tahoo.com), Nov 24 2008`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

AT&T Labs Research