id:A057775 - OEIS Search Results

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a(n) is the least prime p such that p-1 is divisible 2^(n-1) and not by 2^n.

+0
4

2, 3, 5, 41, 17, 97, 193, 641, 257, 7681, 13313, 18433, 12289, 40961, 114689, 163841, 65537, 1179649, 786433, 5767169, 7340033, 23068673, 104857601, 377487361, 754974721, 167772161, 469762049, 2013265921, 3489660929, 12348030977 (list; graph; listen)

	OFFSET	`0,1`
	EXAMPLE	`n=13, a(14)=40961=1+8192.5 where the last term is divisible by the 13-th power of 2 and 40961 is the smallest prime with that property.`
	CROSSREFS	`A000040, A006093.` `Adjacent sequences: A057772 A057773 A057774 this_sequence A057776 A057777 A057778` `Sequence in context: A029499 A128026 A041443 this_sequence A088483 A136015 A106713`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Nov 02 2000`
	EXTENSIONS	`More terms from Larry Reeves (larryr(AT)acm.org), Nov 03 2000`

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Last modified October 12 15:26 EDT 2008. Contains 144830 sequences.

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