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 A176767 Smallest power of 7 whose decimal expansion contains n. 1
 2401, 1, 2401, 343, 49, 823543, 16807, 7, 16807, 49, 96889010407, 117649, 13841287201, 13841287201, 11398895185373143, 4747561509943, 16807, 117649, 11398895185373143, 1977326743, 13841287201, 3909821048582988049 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS This is to 7 as A176763 is to 3 and as A030001 is to 2. LINKS Table of n, a(n) for n=0..21. FORMULA a(n) = MIN{A000420(i) such that n in decimal representation is a substring of A000420(i)}. a(n) = 7^A062524(n). - Michel Marcus, Sep 30 2014 EXAMPLE a(1) = 1 because 7^0 = 1 has "1" as a substring (not a proper substring, though). a(2) = 2401 because 7^4 = 2401 has "2" as a substring. a(3) = 343 because 7^3 = 343 has "3" as a substring. CROSSREFS Cf. A000420, A030001, A176763, A176764-A176773. Sequence in context: A235259 A321638 A005073 * A018865 A186488 A186487 Adjacent sequences: A176764 A176765 A176766 * A176768 A176769 A176770 KEYWORD base,easy,nonn AUTHOR Jonathan Vos Post, Apr 25 2010 EXTENSIONS More terms from Sean A. Irvine and Jon E. Schoenfield, May 05 2010 Extended to a(0) by M. F. Hasler, Oct 03 2014 STATUS approved

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Last modified February 27 14:28 EST 2024. Contains 370376 sequences. (Running on oeis4.)