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A128155 a(n) = least k such that the remainder when 15^k is divided by k is n. 26
2, 13, 6, 11, 10, 533, 218, 119, 12, 145, 214, 57, 106, 17149, 17, 3736136819, 26, 117, 206, 143, 34, 427, 202, 871, 40, 25397, 54, 6877, 52, 115, 194, 6839309, 48, 4857103, 38, 63, 94, 94043, 62, 95, 46, 303, 182, 121214771, 55, 1137417899, 178, 3327, 116 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MATHEMATICA
t = Table[0, {10000} ]; k = 1; While[ k < 3000000000, a = PowerMod[15, k, k]; If[a < 10001 && t[[a]] == 0, t[[a]] = k; Print[{a, k}]]; k++ ]; t
CROSSREFS
Sequence in context: A213828 A324003 A176466 * A211366 A158088 A124869
KEYWORD
hard,nonn
AUTHOR
Alexander Adamchuk, Feb 16 2007
EXTENSIONS
More terms from Ryan Propper, Feb 28 2007
STATUS
approved

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Last modified March 19 03:33 EDT 2024. Contains 370952 sequences. (Running on oeis4.)