A044404 Numbers n such that string 7,2 occurs in the base 10 representation of n but not of n-1.

72, 172, 272, 372, 472, 572, 672, 720, 772, 872, 972, 1072, 1172, 1272, 1372, 1472, 1572, 1672, 1720, 1772, 1872, 1972, 2072, 2172, 2272, 2372, 2472, 2572, 2672, 2720, 2772, 2872, 2972, 3072, 3172, 3272, 3372, 3472, 3572

Offset

1,1

Links

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

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n], {7, 2}]>0, 1, 0], {n, 4000}], {0, 1}][[;; , 2]] (* Harvey P. Dale, Apr 10 2023 *)

Crossrefs

Sequence in context: A044704 A302364 A208087 * A044785 A254437 A304376

Adjacent sequences: A044401 A044402 A044403 * A044405 A044406 A044407

Keyword

nonn,base

Author

Clark Kimberling

Status

approved