A044552 - OEIS

A044552

Numbers n such that string 4,5 occurs in the base 7 representation of n but not of n+1.

33, 82, 131, 180, 229, 237, 278, 327, 376, 425, 474, 523, 572, 580, 621, 670, 719, 768, 817, 866, 915, 923, 964, 1013, 1062, 1111, 1160, 1209, 1258, 1266, 1307, 1356, 1405, 1454, 1503, 1552, 1601, 1609, 1665, 1699, 1748, 1797

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

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

MATHEMATICA

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 7], {4, 5}]>0, 1, 0], {n, 2000}], {1, 0}][[All, 1]] (* Harvey P. Dale, Nov 24 2021 *)

CROSSREFS

Sequence in context: A001987 A094846 A044171 * A045939 A056809 A073251

Adjacent sequences: A044549 A044550 A044551 * A044553 A044554 A044555

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved