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 A075018 Smallest k such that the concatenation k, k-1,k-2,k-3 is divisible by n; or 0 if no such number exists. 0
 3, 3, 3, 5, 3, 3, 5, 5, 6, 3, 18, 9, 11, 5, 3, 15, 13, 15, 19, 23, 18, 29, 29, 15, 28, 11, 33, 5, 4, 3, 40, 15, 18, 13, 18, 15, 28, 19, 24, 23, 26, 39, 7, 51, 33, 29, 55, 15, 53, 53, 30, 63, 54, 33, 18, 5, 57, 41, 56, 63, 69, 71, 60, 15, 63 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..65. EXAMPLE a(7) = 5 as 7 divides 5432. MATHEMATICA Transpose[Flatten[Table[Select[Reverse[Partition[Range[100, 0, -1], 4, 1]], Divisible[FromDigits[Flatten[IntegerDigits/@#]], n]&, 1], {n, 70}], 1]] [[1]] (* Harvey P. Dale, Nov 22 2011 *) CROSSREFS Cf. A075113, A075114, A075115, A075116, A075117. Sequence in context: A318240 A262289 A096918 * A324974 A125958 A247244 Adjacent sequences: A075015 A075016 A075017 * A075019 A075020 A075021 KEYWORD base,nonn AUTHOR Amarnath Murthy, Sep 01 2002 EXTENSIONS Corrected and extended by Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 19 2003 STATUS approved

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Last modified August 9 20:04 EDT 2024. Contains 375044 sequences. (Running on oeis4.)