A044174 - OEIS

A044174

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

36, 85, 134, 183, 232, 252, 281, 330, 379, 428, 477, 526, 575, 595, 624, 673, 722, 771, 820, 869, 918, 938, 967, 1016, 1065, 1114, 1163, 1212, 1261, 1281, 1310, 1359, 1408, 1457, 1506, 1555, 1604, 1624, 1653, 1702, 1751, 1764

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OFFSET

1,1

LINKS

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

MATHEMATICA

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 7], {5, 1}]>0, 1, 0], {n, 2000}], {0, 1}][[All, 2]] (* Harvey P. Dale, Mar 03 2019 *)

CROSSREFS

Sequence in context: A043183 A039360 A043963 * A044555 A283635 A305068

Adjacent sequences: A044171 A044172 A044173 * A044175 A044176 A044177

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved