id:A066263 - OEIS Search Results

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2^n+1 has just two distinct prime factors.

+0
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	OFFSET	`1,1`
	LINKS	`Samuel S. Wagstaff, The Cunningham Project`
	MATHEMATICA	`f[n_] := First[ Transpose[ FactorInteger[2^n + 1, FactorComplete -> True]]]; Select[ Range[100], Length[f[ # ]] == 2 & ]`
	CROSSREFS	`Cf. A073936.` `Sequence in context: A047575 A014097 A081407 this_sequence A089192 A132829 A096820` `Adjacent sequences: A066260 A066261 A066262 this_sequence A066264 A066265 A066266`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Dec 31 2001`
	EXTENSIONS	`Edited by Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 03 2002`

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Last modified July 6 17:22 EDT 2008. Contains 140988 sequences.

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