A044752 Numbers n such that string 3,9 occurs in the base 10 representation of n but not of n+1.

39, 139, 239, 339, 399, 439, 539, 639, 739, 839, 939, 1039, 1139, 1239, 1339, 1399, 1439, 1539, 1639, 1739, 1839, 1939, 2039, 2139, 2239, 2339, 2399, 2439, 2539, 2639, 2739, 2839, 2939, 3039, 3139, 3239, 3339, 3399, 3439

Offset

1,1

Links

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

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n], {3, 9}]>0, 1, 0], {n, 3500}], {1, 0}][[All, 1]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Mar 28 2020 *)

Crossrefs

Sequence in context: A072933 A118634 A044371 * A072253 A128826 A240902

Adjacent sequences: A044749 A044750 A044751 * A044753 A044754 A044755

Keyword

nonn,base

Author

Clark Kimberling

Status

approved