id:A102368 - OEIS Search Results

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Smallest k>0 such that n^k + 1 is not prime.

+0
1

3, 1, 3, 1, 3, 1, 1, 1, 3, 1, 2, 1, 1, 1, 3, 1, 2, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 1, 3, 1, 1, 1, 3, 1, 2, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 1, 3, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 2, 1, 1, 1, 2 (list; graph; listen)

	OFFSET	`2,1`
	COMMENT	`a(odd) = 1.`
	EXAMPLE	`n=10: 10^1+1=11=A000040(5), 10^2+1=101=A000040(26), but 10^3+1=1001=71113, therefore a(10)=3.`
	CROSSREFS	`Sequence in context: A138291 A062174 A154754 this_sequence A063062 A066056 A153284` `Adjacent sequences: A102365 A102366 A102367 this_sequence A102369 A102370 A102371`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Feb 22 2005`

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Last modified November 22 20:51 EST 2009. Contains 167312 sequences.

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