A044282 - OEIS

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A044282

Numbers n such that string 3,4 occurs in the base 9 representation of n but not of n-1.

31, 112, 193, 274, 279, 355, 436, 517, 598, 679, 760, 841, 922, 1003, 1008, 1084, 1165, 1246, 1327, 1408, 1489, 1570, 1651, 1732, 1737, 1813, 1894, 1975, 2056, 2137, 2218, 2299, 2380, 2461, 2466, 2511, 2623, 2704, 2785

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OFFSET

1,1

LINKS

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

MATHEMATICA

Flatten[Position[Partition[Table[If[MemberQ[Partition[ IntegerDigits[ n, 9], 2, 1], {3, 4}], 1, 0], {n, 3000}], 2, 1], {0, 1}]]+1 (* Harvey P. Dale, Feb 25 2015 *)

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 9], {3, 4}]>0, 1, 0], {n, 3000}], {0, 1}][[All, 2]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Aug 14 2019 *)

CROSSREFS

Sequence in context: A142177 A281194 A063397 * A044663 A142228 A304241

Adjacent sequences: A044279 A044280 A044281 * A044283 A044284 A044285

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved