A044303 Numbers n such that string 5,7 occurs in the base 9 representation of n but not of n-1.

52, 133, 214, 295, 376, 457, 468, 538, 619, 700, 781, 862, 943, 1024, 1105, 1186, 1197, 1267, 1348, 1429, 1510, 1591, 1672, 1753, 1834, 1915, 1926, 1996, 2077, 2158, 2239, 2320, 2401, 2482, 2563, 2644, 2655, 2725, 2806

Offset

1,1

Links

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

Mathematica

Transpose[SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 9], {5, 7}]>0, 1, 0], {n, 3000}], {0, 1}]][[2]] (* The program uses the SequencePosition and SequenceCount functions from Mathematica version 10 *) (* Harvey P. Dale, Nov 26 2015 *)

Crossrefs

Sequence in context: A120534 A122166 A205221 * A044684 A346882 A227703

Adjacent sequences: A044300 A044301 A044302 * A044304 A044305 A044306

Keyword

nonn,base

Author

Clark Kimberling

Status

approved