id:A092559 - OEIS Search Results

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Numbers n such that 2^n + 1 is a semiprime.

+0
7

3, 5, 6, 7, 11, 12, 13, 17, 19, 20, 23, 28, 31, 32, 40, 43, 61, 64, 79, 92, 101, 104, 127, 128, 148, 167, 191, 199, 256, 313, 347, 356, 596, 692, 701 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`First unknown: 827.`
	LINKS	`S. S. Wagstaff, Jr., The Cunningham Project`
	EXAMPLE	`11 is a member because 2^11+1=3*683`
	CROSSREFS	`Cf. A085724, A092558, A092561 and A092562.` `Sequence in context: A136804 A129802 A023854 this_sequence A064728 A046839 A003601` `Adjacent sequences: A092556 A092557 A092558 this_sequence A092560 A092561 A092562`
	KEYWORD	`nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), Feb 27 2004`
	EXTENSIONS	`More terms from Cunningham project, Mar 23 2004`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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