A044148 Numbers n such that the string 1,3 occurs in the base 7 representation of n but not of n-1.

10, 59, 70, 108, 157, 206, 255, 304, 353, 402, 413, 451, 490, 549, 598, 647, 696, 745, 756, 794, 843, 892, 941, 990, 1039, 1088, 1099, 1137, 1186, 1235, 1284, 1333, 1382, 1431, 1442, 1480, 1529, 1578, 1627, 1676, 1725, 1774

Offset

1,1

Links

Table of n, a(n) for n=1..42.

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 7], {1, 3}]>0, 1, 0], {n, 2000}], {0, 1}][[All, 2]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Apr 08 2018 *)

Crossrefs

Sequence in context: A126730 A126478 A223470 * A044529 A129330 A045950

Adjacent sequences: A044145 A044146 A044147 * A044149 A044150 A044151

Keyword

nonn,base

Author

Clark Kimberling

Extensions

Definition reworded by Harvey P. Dale, Apr 08 2018

Status

approved