id:A088782 - OEIS Search Results

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a(n) = smallest k>0 such that concatenation of n^k and 1 is prime, or 0 if no such number exists.

+0
3

1, 2, 1, 1, 2, 1, 1, 2, 2, 1, 10, 0, 1, 6, 1, 3, 1356, 1, 1, 2, 1, 15, 0, 1, 1, 2, 1, 1, 4, 2, 1, 0, 1, 0, 2, 3, 2, 4, 4, 1, 2, 1, 1, 6, 0, 1, 2, 2, 1, 4, 3, 1, 16, 1, 9, 0, 1, 2, 36, 1, 165, 66, 1, 1, 0, 1, 0, 6, 1, 1, 2, 12, 3, 138, 1, 1, 4, 0, 5, 4, 1, 1, 2, 5, 2, 2, 3, 1, 0, 2, 1, 24, 2, 1, 42, 7, 1, 0, 1 (list; graph; listen)

	OFFSET	`1,2`
	MATHEMATICA	`f[n_] := Block[{k = 1}, While[ !PrimeQ[10*n^k + 1], k++ ]; k]]; f[1] = 1; Table[ f[n], {n, 1, 99}] (from Robert G. Wilson v (rgwv(AT)rgwv.com), Oct 29 2003)`
	CROSSREFS	`Cf. A088622, A088783.` `Adjacent sequences: A088779 A088780 A088781 this_sequence A088783 A088784 A088785` `Sequence in context: A050412 A025898 A025849 this_sequence A066672 A134024 A029316`
	KEYWORD	`base,nonn`
	AUTHOR	`Ray Chandler (rayjchandler(AT)sbcglobal.net), Oct 23 2003`

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Last modified October 15 20:12 EDT 2008. Contains 145099 sequences.

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