A044371 - OEIS

A044371

Numbers n such that string 3,9 occurs in the base 10 representation of n but not of n-1.

39, 139, 239, 339, 390, 439, 539, 639, 739, 839, 939, 1039, 1139, 1239, 1339, 1390, 1439, 1539, 1639, 1739, 1839, 1939, 2039, 2139, 2239, 2339, 2390, 2439, 2539, 2639, 2739, 2839, 2939, 3039, 3139, 3239, 3339, 3390, 3439

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OFFSET

1,1

LINKS

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

MATHEMATICA

Transpose[SequencePosition[Table[If[SequenceCount[IntegerDigits[n], {3, 9}]>0, 1, 0], {n, 3500}], {0, 1}]][[2]] (* The program uses the SequencePosition and SequenceCount functions from Mathematica version 10 *) (* Harvey P. Dale, Jun 03 2015 *)

CROSSREFS

Sequence in context: A082656 A072933 A118634 * A044752 A072253 A128826

Adjacent sequences: A044368 A044369 A044370 * A044372 A044373 A044374

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved