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A044399 Numbers n such that string 6,7 occurs in the base 10 representation of n but not of n-1. 0
67, 167, 267, 367, 467, 567, 667, 670, 767, 867, 967, 1067, 1167, 1267, 1367, 1467, 1567, 1667, 1670, 1767, 1867, 1967, 2067, 2167, 2267, 2367, 2467, 2567, 2667, 2670, 2767, 2867, 2967, 3067, 3167, 3267, 3367, 3467, 3567 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..39.

MATHEMATICA

Select[Range[4000], MemberQ[Partition[IntegerDigits[#], 2, 1], {6, 7}] && !MemberQ[Partition[IntegerDigits[#-1], 2, 1], {6, 7}]&] (* Harvey P. Dale, Sep 24 2013 *)

CROSSREFS

Sequence in context: A033233 A335361 A142323 * A044780 A244773 A199824

Adjacent sequences:  A044396 A044397 A044398 * A044400 A044401 A044402

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified June 26 06:36 EDT 2022. Contains 354877 sequences. (Running on oeis4.)