A044315 Numbers n such that string 7,1 occurs in the base 9 representation of n but not of n-1.

64, 145, 226, 307, 388, 469, 550, 576, 631, 712, 793, 874, 955, 1036, 1117, 1198, 1279, 1305, 1360, 1441, 1522, 1603, 1684, 1765, 1846, 1927, 2008, 2034, 2089, 2170, 2251, 2332, 2413, 2494, 2575, 2656, 2737, 2763, 2818

Offset

1,1

Links

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

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 9], {7, 1}]>0, 1, 0], {n, 3000}], {0, 1}][[All, 2]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Nov 12 2017 *)

Crossrefs

Sequence in context: A110232 A348548 A188244 * A044696 A235120 A195233

Adjacent sequences: A044312 A044313 A044314 * A044316 A044317 A044318

Keyword

nonn,base

Author

Clark Kimberling

Status

approved