

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
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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. AdamsWatters.
Highest known position is 233th digit from the right for a(34).  Bert Dobbelaere, Jan 22 2019


LINKS

Table of n, a(n) for n=1..34.


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: A258938 A004763 A320456 * 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


STATUS

approved



