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 A215736 a(n) is the first digit to appear n times in succession in a power of 7. 12
 1, 1, 7, 9, 5, 7, 3, 1, 0, 0, 3, 4, 6, 5, 9 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS Table of n, a(n) for n=1..15. MATHEMATICA n = 1; x = 1; lst = {}; For[i = 1, i <= 10000, i++, z = Split[IntegerDigits[x]]; a = Length /@ z; b = Max[a]; For[j = n, j <= b, j++, AppendTo[lst, First[First[Part[z, First[Position[a, b]]]]]]; n++ ]; x = 7 x ]; lst (* Robert Price, Mar 16 2019 *) CROSSREFS Cf. A215730, A045875, A215732. Sequence in context: A070693 A198417 A363687 * A132715 A154910 A063603 Adjacent sequences: A215733 A215734 A215735 * A215737 A215738 A215739 KEYWORD nonn,base,more AUTHOR V. Raman, Aug 22 2012 EXTENSIONS a(10) added by V. Raman, Nov 23 2013 a(11)-a(13) from Giovanni Resta, Apr 19 2016 a(14)-a(15) from Bert Dobbelaere, Feb 15 2019 STATUS approved

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Last modified December 11 01:03 EST 2023. Contains 367717 sequences. (Running on oeis4.)