A044399 Numbers n such that string 6,7 occurs in the base 10 representation of n but not of n-1.

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

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: A335361 A142323 A372936 * A044780 A244773 A199824

Adjacent sequences: A044396 A044397 A044398 * A044400 A044401 A044402

Keyword

nonn,base

Author

Clark Kimberling

Status

approved