A007734 - OEIS

A007734

Period of repeating digits of 1/n in base 3.

1, 1, 1, 2, 4, 1, 6, 2, 1, 4, 5, 2, 3, 6, 4, 4, 16, 1, 18, 4, 6, 5, 11, 2, 20, 3, 1, 6, 28, 4, 30, 8, 5, 16, 12, 2, 18, 18, 3, 4, 8, 6, 42, 10, 4, 11, 23, 4, 42, 20, 16, 6, 52, 1, 20, 6, 18, 28, 29, 4, 10, 30, 6, 16, 12, 5, 22, 16, 11, 12, 35, 2, 12, 18, 20, 18, 30, 3, 78, 4, 1, 8, 41, 6, 16, 42

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OFFSET

1,4

LINKS

T. D. Noe, Table of n, a(n) for n=1..1000

Index entries for sequences related to decimal expansion of 1/n

MATHEMATICA

f[n_] := MultiplicativeOrder[3, n/(3^IntegerExponent[n, 3])]; Array[f, 80] (* Robert G. Wilson v, Jun 10 2011 *)

PROG

(PARI) a(n)=znorder(Mod(3, n/3^valuation(n, 3))) \\ Charles R Greathouse IV, Jun 10 2011

CROSSREFS

Sequence in context: A307796 A095247 A376121 * A171233 A362004 A096907