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 A063570 Smallest positive power of 7 having n in its decimal representation. 2
 4, 4, 4, 3, 2, 7, 5, 1, 5, 2, 13, 6, 12, 12, 19, 15, 5, 6, 19, 11, 12, 22, 14, 7, 4, 30, 11, 23, 10, 16, 14, 19, 11, 16, 3, 7, 9, 19, 12, 17, 4, 12, 27, 3, 18, 21, 32, 10, 8, 2, 15, 17, 10, 9, 7, 21, 15, 8, 21, 18, 9 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Chai Wah Wu, Table of n, a(n) for n = 0..10000 MATHEMATICA a = {}; Do[k = 1; While[ StringPosition[ ToString[7^k], ToString[n] ] == {}, k++ ]; a = Append[a, k], {n, 0, 60} ]; a PROG (Python) def A063570(n):     m, k, s = 1, 7, str(n)     while s not in str(k):         m += 1         k *= 7     return m # Chai Wah Wu, Nov 14 2019 CROSSREFS Essentially the same as A062524. Sequence in context: A063448 A232526 A117499 * A023977 A073259 A174987 Adjacent sequences:  A063567 A063568 A063569 * A063571 A063572 A063573 KEYWORD base,nonn AUTHOR Robert G. Wilson v, Aug 10 2001 STATUS approved

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Last modified September 18 07:39 EDT 2020. Contains 337166 sequences. (Running on oeis4.)