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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 (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.

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

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Last modified August 24 17:01 EDT 2019. Contains 326295 sequences. (Running on oeis4.)