id:A138066 - OEIS Search Results

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Least k>0 such that (2n-1)^k + 2 is prime, or 0 if no such number exists.

+0
2

1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 11, 0, 1, 1, 0, 2, 1, 0, 1, 1, 0, 1, 113, 0, 1, 7, 0, 1, 1, 0, 3, 1, 0, 1, 1, 0, 12, 1, 0, 1, 3, 0, 1, 255, 0, 8, 1, 0, 1, 1, 0, 1, 1, 0, 1, 3, 0, 2, 15, 0, 2, 1, 0, 1, 23, 0, 1, 1, 0, 4, 3, 0, 1, 1, 0, 3, 1, 0, 136, 1, 0, 1 (list; graph; listen)

	OFFSET	`1,12`
	COMMENT	`a(3n+1) = 0 for n>0.` `a(84) is currently unknown.`
	CROSSREFS	`Cf. A084713 = Smallest prime of the form (2n-1)^k + 2, or 0 if no such number exists. Cf. A138067 = Least k>1 such that (2n-1)^k + 2 is prime, or 0 if no such number exists. Cf. A051783 = Numbers n such that 3^n + 2 is prime. Cf. A087885 = Numbers n such that 5^n + 2 is prime. Cf. A090649, A109076, A113480, A138048, A138049, A138050, A138051, A087886, A113481.` `Sequence in context: A131679 A113043 A110408 this_sequence A115595 A003621 A055963` `Adjacent sequences: A138063 A138064 A138065 this_sequence A138067 A138068 A138069`
	KEYWORD	`hard,more,nonn`
	AUTHOR	`Alexander Adamchuk (alex(AT)kolmogorov.com), Mar 02 2008`

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Last modified November 23 10:40 EST 2009. Contains 167421 sequences.

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