A044540 Numbers n such that string 3,0 occurs in the base 7 representation of n but not of n+1.

21, 70, 119, 153, 168, 217, 266, 315, 364, 413, 462, 496, 511, 560, 609, 658, 707, 756, 805, 839, 854, 903, 952, 1001, 1077, 1099, 1148, 1182, 1197, 1246, 1295, 1344, 1393, 1442, 1491, 1525, 1540, 1589, 1638, 1687, 1736, 1785

Offset

1,1

Links

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

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 7], {3, 0}]>0, 1, 0], {n, 2000}], {1, 0}][[All, 1]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jul 03 2017 *)

Crossrefs

Sequence in context: A201066 A200931 A044159 * A195026 A296035 A102233

Adjacent sequences: A044537 A044538 A044539 * A044541 A044542 A044543

Keyword

nonn,base

Author

Clark Kimberling

Status

approved