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A007736
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Period of repeating digits of 1/n in base 5.
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3
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1, 1, 2, 1, 1, 2, 6, 2, 6, 1, 5, 2, 4, 6, 2, 4, 16, 6, 9, 1, 6, 5, 22, 2, 1, 4, 18, 6, 14, 2, 3, 8, 10, 16, 6, 6, 36, 9, 4, 2, 20, 6, 42, 5, 6, 22, 46, 4, 42, 1, 16, 4, 52, 18, 5, 6, 18, 14, 29, 2, 30, 3, 6, 16, 4, 10, 22, 16, 22, 6, 5, 6, 72, 36, 2, 9, 30, 4, 39, 4, 54, 20, 82, 6, 16, 42, 14, 10, 44
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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LINKS
| T. D. Noe, Table of n, a(n) for n=1..1000
Index entries for sequences related to decimal expansion of 1/n
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MATHEMATICA
| f[n_] := MultiplicativeOrder[5, n/(5^IntegerExponent[n, 5])]; Array[f, 80] (* Robert G. Wilson v, June 10 2011 *)
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PROG
| (PARI) A007736(n, bas)={ local(p) ; for(sp=2, 1000000, for(s=1, sp-1, p=sp-s ; if( ((bas^p-1)*bas^s) % n == 0, return(p) ; ) ; ) ; ) ; return(-1) ; } { for(n=1, 100, print(n, " ", A007736(n, 5)) ; ) ; } - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 30 2006
(PARI) a(n)=znorder(Mod(5, n/5^valuation(n, 5))) \\ Charles R Greathouse IV, Jun 10 2011
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CROSSREFS
| Sequence in context: A156588 A113186 A123218 * A107042 A134830 A022874
Adjacent sequences: A007733 A007734 A007735 * A007737 A007738 A007739
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KEYWORD
| nonn,base
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Hal Sampson [ hals(AT)easynet.com ], David W. Wilson (davidwwilson(AT)comcast.net)
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