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 A128157 a(n) = least k such that the remainder when 17^k is divided by k is n. 26
 2, 3, 7, 13, 142, 11, 25, 9, 10, 299, 57, 203, 46, 69, 274, 613024059983, 19, 7099195, 30, 21, 134, 24065, 38, 133, 28, 27, 205, 155591, 33, 20452755522967, 49, 165, 35, 391, 99, 94271801, 198, 39, 70, 23353, 62, 2759, 55, 1623, 122, 22649, 665, 1591398755 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS MATHEMATICA t = Table[0, {10000} ]; k = 1; While[ k < 4500000000, a = PowerMod[17, k, k]; If[a < 10001 && t[[a]] == 0, t[[a]] = k; Print[{a, k}]]; k++ ]; t CROSSREFS Cf. A036236, A078457, A119678, A119679, A127816, A119715, A119714, A127817, A127818, A127819, A127820, A127821, A128154, A128155, A128156, A128158, A128159, A128160, A128149, A128150. Sequence in context: A254461 A048463 A006695 * A259488 A073827 A081940 Adjacent sequences:  A128154 A128155 A128156 * A128158 A128159 A128160 KEYWORD hard,nonn AUTHOR Alexander Adamchuk, Feb 16 2007 EXTENSIONS More terms from Hagen von Eitzen, Jul 31 2009 a(338) = 7615772967 = 3 * 11 * 230780999 [From Daniel Morel, May 18 2010] a(100) = 36706228199, a(154) = 10618746241, a(444) = 10700153359, a(616) = 7969009427, a(720) = 11004291191, a(984) = 11601377453 [From Daniel Morel, Jun 15 2010] a(184) = 16808380397, a(508) = 34412778035 [From Daniel Morel, Nov 05 2010] STATUS approved

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Last modified September 18 22:28 EDT 2021. Contains 347548 sequences. (Running on oeis4.)