A044294 Numbers n such that string 4,7 occurs in the base 9 representation of n but not of n-1.

43, 124, 205, 286, 367, 387, 448, 529, 610, 691, 772, 853, 934, 1015, 1096, 1116, 1177, 1258, 1339, 1420, 1501, 1582, 1663, 1744, 1825, 1845, 1906, 1987, 2068, 2149, 2230, 2311, 2392, 2473, 2554, 2574, 2635, 2716, 2797

Offset

1,1

Links

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

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 9], {4, 7}]>0, 1, 0], {n, 3000}], {0, 1}][[All, 2]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, May 09 2018 *)

Crossrefs

Sequence in context: A248018 A262491 A029816 * A044675 A112270 A356510

Adjacent sequences: A044291 A044292 A044293 * A044295 A044296 A044297

Keyword

nonn,base

Author

Clark Kimberling

Status

approved