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A044157 Numbers n such that string 2,5 occurs in the base 7 representation of n but not of n-1. 0
19, 68, 117, 133, 166, 215, 264, 313, 362, 411, 460, 476, 509, 558, 607, 656, 705, 754, 803, 819, 852, 901, 931, 999, 1048, 1097, 1146, 1162, 1195, 1244, 1293, 1342, 1391, 1440, 1489, 1505, 1538, 1587, 1636, 1685, 1734, 1783 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

MATHEMATICA

Flatten[Position[Partition[Table[If[MemberQ[Partition[IntegerDigits[ n, 7], 2, 1], {2, 5}], 1, 0], {n, 2000}], 2, 1], {0, 1}]]+1 (* Harvey P. Dale, Mar 04 2015 *)

CROSSREFS

Sequence in context: A139927 A337197 A228670 * A044538 A297226 A300463

Adjacent sequences:  A044154 A044155 A044156 * A044158 A044159 A044160

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified October 15 18:40 EDT 2021. Contains 348033 sequences. (Running on oeis4.)