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 A239015 Exponents m such that the decimal expansion of 11^m exhibits its first zero from the right later than any previous exponent. 7
 0, 1, 2, 3, 4, 6, 7, 8, 9, 12, 13, 14, 15, 16, 18, 36, 41, 366, 488, 4357, 69137, 89371, 143907, 542116, 2431369, 5877361, 8966861, 121915452, 123793821, 221788016, 709455085, 1571200127, 2640630712, 6637360862, 64994336645, 74770246842 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Assume that a zero precedes all decimal expansions. This will take care of those cases in A001020. Inspired by the seqfan list discussion Re: "possible sequence", beginning with David Wilson 7:57 PM Mar 06 2014 and continued by M. F. Hasler, Allan Wechsler and Franklin T. Adams-Watters. LINKS EXAMPLE Illustration of initial term, with the 0 enclosed in parentheses: n, position of 0, 11^a(n) 1, 2, (0)1 2, 3, (0)11 3, 4, (0)121 4, 5, (0)1331 5, 6, (0)14641 6, 7, (0)1771561 7, 8, (0)19487171 8, 9, (0)214358881 9, 10, (0)2357947691 10, 11, (0)3138428376721 11, 12, (0)34522712143931 12, 13, (0)379749833583241 13, 14, (0)4177248169415651 14, 15, (0)45949729863572161 15, 16, (0)5559917313492231481 16, 17, 3091268053287(0)672635673352936887453361 ... - N. J. A. Sloane, Jan 16 2020 MATHEMATICA f[n_] := Position[ Reverse@ Join[{0}, IntegerDigits[ PowerMod[11, n, 10^500]]], 0, 1, 1][[1, 1]]; k = mx = 0; lst = {}; While[k < 40000001, c = f[k]; If[c > mx, mx = c; AppendTo[ lst, k]; Print@ k]; k++]; lst CROSSREFS Cf. A001020, A030706, A020665, A031142, A239008, A239009, A239010, A239011, A239012, A239013, A239014. Sequence in context: A330108 A330104 A330120 * A030706 A285986 A101883 Adjacent sequences:  A239012 A239013 A239014 * A239016 A239017 A239018 KEYWORD nonn,base,more AUTHOR Charles R Greathouse IV and Robert G. Wilson v, Mar 14 2014 EXTENSIONS a(28)-a(34) from Bert Dobbelaere, Jan 22 2019 a(35)-a(36) from Chai Wah Wu, Jan 16 2020 STATUS approved

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Last modified May 16 19:46 EDT 2021. Contains 343951 sequences. (Running on oeis4.)