A044212 Numbers n such that string 3,1 occurs in the base 8 representation of n but not of n-1.

25, 89, 153, 200, 217, 281, 345, 409, 473, 537, 601, 665, 712, 729, 793, 857, 921, 985, 1049, 1113, 1177, 1224, 1241, 1305, 1369, 1433, 1497, 1561, 1600, 1689, 1736, 1753, 1817, 1881, 1945, 2009, 2073, 2137, 2201, 2248, 2265

Offset

1,1

Links

Table of n, a(n) for n=1..41.

Mathematica

Transpose[SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 8], {3, 1}]>0, 1, 0], {n, 2300}], {0, 1}]][[2]] (* The program uses the SequencePosition and SequenceCount functions from Mathematica version 10 *) (* Harvey P. Dale, Oct 23 2015 *)

Crossrefs

Sequence in context: A027026 A251195 A087240 * A044593 A262492 A280297

Adjacent sequences: A044209 A044210 A044211 * A044213 A044214 A044215

Keyword

nonn,base

Author

Clark Kimberling

Status

approved