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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 T. D. Noe, Table of n, a(n) for n=1..1000 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: A094593 A327814 A188348 * A186520 A158570 A295224 Adjacent sequences:  A007735 A007736 A007737 * A007739 A007740 A007741 KEYWORD nonn,base AUTHOR N. J. A. Sloane, Hal Sampson (hals(AT)easynet.com) STATUS approved

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Last modified October 15 15:14 EDT 2019. Contains 328030 sequences. (Running on oeis4.)