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 A069861 Numbers n that divide the concatenation of next n numbers. 3
 1, 2, 3, 5, 6, 9, 10, 11, 12, 15, 18, 20, 21, 22, 25, 27, 30, 33, 36, 39, 42, 44, 45, 50, 54, 56, 60, 68, 72, 75, 90, 98, 100, 104, 108, 110, 111, 114, 120, 125, 126, 130, 132, 135, 140, 148, 150, 154, 155, 156, 162, 168, 180, 182, 185, 196, 198, 200, 205, 210, 216 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS EXAMPLE 9 divides 101112131415161718 hence is a member. MATHEMATICA f[n_] := Block[{j = 0, k = n + 1}, While[k < 2n + 1, j = ToExpression[ StringJoin[ ToString[j], ToString[k]]]; k++ ]; j]; Select[ Range[300], IntegerQ[ f[ # ] / # ] & ] CROSSREFS Cf. A069860, A069862. Sequence in context: A276476 A069880 A230044 * A047449 A162923 A107040 Adjacent sequences:  A069858 A069859 A069860 * A069862 A069863 A069864 KEYWORD base,nonn AUTHOR Amarnath Murthy, Apr 18 2002 EXTENSIONS Edited, corrected and extended by Robert G. Wilson v STATUS approved

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Last modified October 21 06:39 EDT 2019. Contains 328292 sequences. (Running on oeis4.)