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 A044409 Numbers n such that string 7,7 occurs in the base 10 representation of n but not of n-1. 0
 77, 177, 277, 377, 477, 577, 677, 770, 877, 977, 1077, 1177, 1277, 1377, 1477, 1577, 1677, 1770, 1877, 1977, 2077, 2177, 2277, 2377, 2477, 2577, 2677, 2770, 2877, 2977, 3077, 3177, 3277, 3377, 3477, 3577, 3677, 3770, 3877 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..39. MATHEMATICA SequencePosition[Table[If[SequenceCount[IntegerDigits[n], {7, 7}]>0, 1, 0], {n, 4000}], {0, 1}][[;; , 2]] (* Harvey P. Dale, Feb 17 2024 *) CROSSREFS Sequence in context: A046513 A199994 A043518 * A044790 A255095 A029558 Adjacent sequences: A044406 A044407 A044408 * A044410 A044411 A044412 KEYWORD nonn,base AUTHOR Clark Kimberling STATUS approved

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Last modified April 16 22:11 EDT 2024. Contains 371755 sequences. (Running on oeis4.)