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 A002329 Periods of reciprocals of integers prime to 10. (Formerly M4045 N1678) 25
 1, 6, 1, 2, 6, 16, 18, 6, 22, 3, 28, 15, 2, 3, 6, 5, 21, 46, 42, 16, 13, 18, 58, 60, 6, 33, 22, 35, 8, 6, 13, 9, 41, 28, 44, 6, 15, 96, 2, 4, 34, 53, 108, 3, 112, 6, 48, 22, 5, 42, 21, 130 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Nonzero terms of A084680. REFERENCES J. W. L. Glaisher, On circulating decimals, Proc. Camb. Phil. Soc., 3 (1878), 185-206. D. H. Lehmer, Guide to Tables in the Theory of Numbers. Bulletin No. 105, National Research Council, Washington, DC, 1941, pp. 7-12. N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). LINKS T. D. Noe, Table of n, a(n) for n = 1..1000 Eric Weisstein's World of Mathematics, Decimal Expansion. Eric Weisstein's World of Mathematics, Exponent. Eric Weisstein's World of Mathematics, Multiplicative Order Chai Wah Wu, Pigeonholes and repunits, Amer. Math. Monthly, 121 (2014), 529-533. MATHEMATICA Reap[ Do[ If[ CoprimeQ[n, 10], Sow[ MultiplicativeOrder[10, n]]], {n, 2, 150}]][[2, 1]]  (* Jean-François Alcover, Nov 07 2012 *) PROG (PARI) do(lim)=my(v=List()); for(n=1, lim, if(gcd(n, 10)==1, listput(v, znorder(Mod(10, n))))); Vec(v) \\ Charles R Greathouse IV, Jun 21 2017 CROSSREFS Sequence in context: A216415 A112828 A085766 * A053453 A156792 A021624 Adjacent sequences:  A002326 A002327 A002328 * A002330 A002331 A002332 KEYWORD nonn,base,nice,easy AUTHOR STATUS approved

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Last modified October 15 07:51 EDT 2019. Contains 328026 sequences. (Running on oeis4.)