id:A126614 - OEIS Search Results

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Numbers of the form (2^p+1)/3 where p is a prime.

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13

3, 11, 43, 683, 2731, 43691, 174763, 2796203, 178956971, 715827883, 45812984491, 733007751851, 2932031007403, 46912496118443, 3002399751580331, 192153584101141163, 768614336404564651, 49191317529892137643 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`If p-1 is squarefree, the multiplicative order of 2 modulo a(n) is 2p. - Vladimir Shevelev (shevelev(AT)bgu.ac.il), Jul 15 2008`
	MATHEMATICA	`Table[(2^Prime[x] + 1)/3, {x, 2, 20}]`
	CROSSREFS	`Cf. A000979, A000978, A124400.` `Sequence in context: A039627 A051257 A135482 this_sequence A000979 A123628 A107290` `Adjacent sequences: A126611 A126612 A126613 this_sequence A126615 A126616 A126617`
	KEYWORD	`nonn`
	AUTHOR	`Artur Jasinski (grafix(AT)csl.pl), Feb 09 2007`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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