id:A134855 - OEIS Search Results

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Least odd prime p such that 1 + p*2^n is also prime.

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3, 3, 5, 7, 3, 3, 5, 3, 23, 13, 29, 3, 5, 7, 5, 37, 53, 3, 11, 7, 11, 37, 71, 73, 5, 7, 17, 13, 23, 3, 239, 43, 113, 163, 59, 3, 89, 349, 5, 97, 3, 73, 11, 67, 101, 19, 101, 61, 23, 7, 17, 7, 233, 127, 5, 541, 29, 103, 71, 31, 53, 109, 179, 163, 71, 3, 929, 31, 23, 193, 101, 127 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Let q = 1 + a(n)*2^n. Then q is least prime such that A098006(pi(q)) = 2^(n-1). See A134854 for the values of q.`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..1000`
	MATHEMATICA	`Table[Select[Prime[Range[2, 10000]], PrimeQ[1+2^k # ]&, 1][[1]], {k, 100}]`
	CROSSREFS	`Sequence in context: A095950 A089874 A092035 this_sequence A110246 A070543 A050826` `Adjacent sequences: A134852 A134853 A134854 this_sequence A134856 A134857 A134858`
	KEYWORD	`nonn`
	AUTHOR	`T. D. Noe (noe(AT)sspectra.com), Nov 13 2007`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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