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A016014 Proth numbers: least k such that 2*n*k + 1 is a prime. 7
1, 1, 1, 2, 1, 1, 2, 1, 1, 2, 1, 3, 2, 1, 1, 3, 3, 1, 5, 1, 1, 2, 1, 2, 2, 1, 2, 2, 1, 1, 5, 3, 1, 2, 1, 1, 2, 3, 1, 3, 1, 4, 2, 1, 2, 3, 3, 1, 2, 1, 1, 3, 1, 1, 3, 1, 2, 2, 6, 2, 3, 3, 1, 2, 1, 3, 2, 1, 1, 2, 4, 3, 2, 1, 1, 3, 3, 1, 2, 4, 1, 5, 1, 2, 6, 1, 2, 2, 1, 1, 3, 7, 2, 5, 1, 1, 2, 1, 1 (list; graph; refs; listen; history; internal format)
OFFSET

1,4

MATHEMATICA

Do[k = 1; cp = n*k + 1; While[ ! PrimeQ[cp], k++; cp = n*k + 1]; Print[k], {n, 2, 400, 2}] (from Lei Zhou (lzhou5(AT)emory.edu), Feb 23 2005)

CROSSREFS

Sequence in context: A076845 A161906 A204901 * A067760 A078680 A050412

Adjacent sequences:  A016011 A016012 A016013 * A016015 A016016 A016017

KEYWORD

nonn

AUTHOR

Robert G. Wilson v (rgwv(AT)rgwv.com)

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Last modified February 17 19:13 EST 2012. Contains 206085 sequences.