A044757 Numbers n such that string 4,4 occurs in the base 10 representation of n but not of n+1.

44, 144, 244, 344, 449, 544, 644, 744, 844, 944, 1044, 1144, 1244, 1344, 1449, 1544, 1644, 1744, 1844, 1944, 2044, 2144, 2244, 2344, 2449, 2544, 2644, 2744, 2844, 2944, 3044, 3144, 3244, 3344, 3449, 3544, 3644, 3744, 3844

Offset

1,1

Links

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

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n], {4, 4}]>0, 1, 0], {n, 4000}], {1, 0}][[All, 1]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Dec 09 2018 *)

Crossrefs

Sequence in context: A043506 A044376 A102438 * A204033 A072428 A010023

Adjacent sequences: A044754 A044755 A044756 * A044758 A044759 A044760

Keyword

nonn,base

Author

Clark Kimberling

Status

approved