A044785 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, 729, 772, 872, 972, 1072, 1172, 1272, 1372, 1472, 1572, 1672, 1729, 1772, 1872, 1972, 2072, 2172, 2272, 2372, 2472, 2572, 2672, 2729, 2772, 2872, 2972, 3072, 3172, 3272, 3372, 3472, 3572

Offset

1,1

Links

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

Mathematica

Transpose[SequencePosition[Table[If[SequenceCount[IntegerDigits[n], {7, 2}]>0, 1, 0], {n, 3600}], {1, 0}]][[1]] (* The program uses the SequencePosition and SequenceCount functions from Mathematica version 10 *) (* Harvey P. Dale, May 29 2016 *)

Crossrefs

Sequence in context: A302364 A208087 A044404 * A254437 A304376 A028977

Adjacent sequences: A044782 A044783 A044784 * A044786 A044787 A044788

Keyword

nonn,base

Author

Clark Kimberling

Status

approved