A044035 Numbers k such that 6 and 7 occur juxtaposed in the base-10 representation of k but not of k+1.

67, 76, 167, 176, 267, 276, 367, 376, 467, 476, 567, 576, 667, 679, 769, 776, 867, 876, 967, 976, 1067, 1076, 1167, 1176, 1267, 1276, 1367, 1376, 1467, 1476, 1567, 1576, 1667, 1679, 1769, 1776, 1867, 1876, 1967, 1976, 2067

Offset

1,1

Links

Table of n, a(n) for n=1..41.

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n], {6, 7}]>0 || SequenceCount[ IntegerDigits[ n], {7, 6}]>0, 1, 0], {n, 2100}], {1, 0}][[;; , 1]] (* Harvey P. Dale, Mar 07 2024 *)

Crossrefs

Sequence in context: A277429 A039432 A043255 * A124476 A066475 A106930

Adjacent sequences: A044032 A044033 A044034 * A044036 A044037 A044038

Keyword

nonn,base

Author

Clark Kimberling

Status

approved