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 A254502 a(n) is the smallest nonnegative integer such that a(n)! contains a string of exactly n consecutive 7's. 10
 0, 6, 31, 48, 22, 599, 1102, 5280, 4667, 1753, 48861, 150336, 223254, 644487, 7016773, 9588848 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS EXAMPLE a(1) = 6 since 6! equals 720, which contains '7'. MATHEMATICA A254452[n_] := Module[{m = 0}, If[n == 0, While[MemberQ[IntegerDigits[m!], 7], m++]; m, t = Table[7, n]; While[! MemberQ[Split[IntegerDigits[m!]], t], m++]; m]]; Table[A254452[n], {n, 0, 14}] (* Robert Price, Mar 21 2019 *) CROSSREFS Cf. A254042, A254447, A254448, A254449, A254500, A254501, A254716, A254717. Sequence in context: A043058 A155097 A306331 * A025524 A042841 A215730 Adjacent sequences: A254499 A254500 A254501 * A254503 A254504 A254505 KEYWORD nonn,base,more AUTHOR Martin Y. Champel, Jan 31 2015 EXTENSIONS a(11), a(12) from Jon E. Schoenfield, Feb 21 2015 a(0) prepended by Jon E. Schoenfield, Mar 01 2015 a(13) from Jon E. Schoenfield, Mar 06 2015 a(14)-a(15) from Bert Dobbelaere, Oct 29 2018 STATUS approved

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Last modified January 31 14:57 EST 2023. Contains 359976 sequences. (Running on oeis4.)