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 A098876 Least k such that 3*((6*n)^k) - 1 is prime. 1
 1, 2, 1, 1, 1, 1, 2523, 2, 2, 1, 1, 2, 1, 1, 1, 2, 3, 6, 63, 1, 50, 38, 2, 1, 1, 1, 79, 1, 1, 3, 1, 4, 1, 2, 2, 1, 6, 1, 1, 1, 5, 3, 1, 18, 1, 1, 11, 1, 1, 26, 3, 10, 1, 1, 4, 2, 2, 4, 1, 6, 1, 4, 54, 1, 10, 1, 3, 1, 2, 1, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS a(72) > 3830, and the sequence then continues: 6, 2, 7, 1, 27, 2, 3, 1, 7, 2, 1, 1, 4, 36, 346, 1, 1, 1, 1, 3, 6, 2, 1, 2, 444, ... a(72) > 10^4. - Ray Chandler, Nov 13 2004 LINKS FORMULA a(A138918(n)) = 1. - Michel Marcus, Jul 28 2015 MATHEMATICA f[n_] := Block[{k = 1}, While[ !PrimeQ[3*((6*n)^k) - 1], k++ ]; k]; Table[ f[n], {n, 71}] (* Robert G. Wilson v, Oct 21 2004 *) CROSSREFS Cf. A098877, A138918. Sequence in context: A248975 A016541 A230453 * A143277 A292378 A276183 Adjacent sequences:  A098873 A098874 A098875 * A098877 A098878 A098879 KEYWORD nonn AUTHOR Pierre CAMI, Oct 13 2004 EXTENSIONS Corrected and extended by Robert G. Wilson v, Oct 22 2004 STATUS approved

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Last modified October 17 14:22 EDT 2018. Contains 316281 sequences. (Running on oeis4.)