id:A144861 - OEIS Search Results

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Primitive prime factors of the sequence 2k^2 - 1 in the order that they are found.

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7, 17, 31, 71, 97, 127, 23, 199, 241, 41, 337, 449, 73, 577, 647, 103, 47, 881, 967, 151, 1151, 1249, 193, 1567, 257, 113, 89, 311, 2311, 79, 2591, 2887, 3041, 457, 3361, 3527, 3697, 4049, 4231, 631, 271, 4801, 4999, 743, 5407, 137, 263, 6271, 6961, 313, 1063 (list; graph; listen)

	OFFSET	`2,1`
	COMMENT	`Every Mersenne prime number appear on this sequence. a(n) mod 8 = 1 or 7`
	LINKS	`Bernhard Helmes, http://www.devalco.de/quadr_Sieb_2x^2-1.htm`
	CROSSREFS	`A005529, A144848` `Sequence in context: A056220 A024840 A024835 this_sequence A066436 A128002 A074275` `Adjacent sequences: A144858 A144859 A144860 this_sequence A144862 A144863 A144864`
	KEYWORD	`nonn`
	AUTHOR	`Bernhard Helmes (pi(AT)devalco.de), Sep 23 2008`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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