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A128158 a(n) = least k such that the remainder when 18^k is divided by k is n. 26
17, 14, 5, 7, 13, 106, 11, 158, 927, 314, 6767, 15, 724317787, 62, 21, 20, 407, 19, 319, 38, 39, 302, 150698261, 30, 1055599, 298, 129, 74 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
10^15 < a(29) <= 3612834616189533302730621726282897865691021. - Max Alekseyev, Apr 14 2012
LINKS
MATHEMATICA
t = Table[0, {10000}]; k = 1; While[k < 3000000000, a = PowerMod[18, k, k]; If[a < 10001 && t[[a]] == 0, t[[a]] = k; Print[{a, k}]]; k++ ]; t (* Robert G. Wilson v, Jun 23 2009 *)
CROSSREFS
Sequence in context: A279058 A357190 A195534 * A278824 A085095 A004506
KEYWORD
hard,more,nonn
AUTHOR
Alexander Adamchuk, Feb 16 2007
EXTENSIONS
a(13)-a(28) from Robert G. Wilson v, Jun 23 2009
STATUS
approved

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