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A007738 Period of repeating digits of 1/n in base 7. 2
1, 1, 1, 2, 4, 1, 1, 2, 3, 4, 10, 2, 12, 1, 4, 2, 16, 3, 3, 4, 1, 10, 22, 2, 4, 12, 9, 2, 7, 4, 15, 4, 10, 16, 4, 6, 9, 3, 12, 4, 40, 1, 6, 10, 12, 22, 23, 2, 1, 4, 16, 12, 26, 9, 20, 2, 3, 7, 29, 4, 60, 15, 3, 8, 12, 10, 66, 16, 22, 4, 70, 6, 24, 9, 4, 6, 10, 12, 78, 4, 27, 40, 41, 2, 16, 6, 7, 10 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,4
LINKS
MATHEMATICA
f[n_] := MultiplicativeOrder[7, n/(7^IntegerExponent[n, 7])]; Array[f, 80] (* Robert G. Wilson v, Jun 10 2011 *)
PROG
(PARI) a(n)=znorder(Mod(7, n/7^valuation(n, 7))) \\ Charles R Greathouse IV, Jun 10 2011
CROSSREFS
Sequence in context: A327814 A188348 A336434 * A186520 A158570 A295224
KEYWORD
nonn,base
AUTHOR
N. J. A. Sloane, Hal Sampson (hals(AT)easynet.com)
STATUS
approved

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Last modified April 12 09:56 EDT 2024. Contains 371627 sequences. (Running on oeis4.)