id:A134854 - OEIS Search Results

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Least prime of the form 1 + p*2^n, where p is an odd prime.

+0
4

7, 13, 41, 113, 97, 193, 641, 769, 11777, 13313, 59393, 12289, 40961, 114689, 163841, 2424833, 6946817, 786433, 5767169, 7340033, 23068673, 155189249, 595591169, 1224736769, 167772161, 469762049, 2281701377, 3489660929, 12348030977 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`a(n) least prime such that A098006(pi(a(n))) = 2^(n-1). See A134855 for the values of p.`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..1000`
	MATHEMATICA	`Table[Select[1+2^n*Prime[Range[2, 100]], PrimeQ, 1][[1]], {n, 41}]`
	CROSSREFS	`Sequence in context: A056249 A107207 A045464 this_sequence A097444 A151781 A047977` `Adjacent sequences: A134851 A134852 A134853 this_sequence A134855 A134856 A134857`
	KEYWORD	`nonn`
	AUTHOR	`T. D. Noe (noe(AT)sspectra.com), Nov 13 2007`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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