A043212 Numbers k such that 5 and 8 occur juxtaposed in the base-9 representation of k but not of k-1.

53, 77, 134, 158, 215, 239, 296, 320, 377, 401, 458, 477, 539, 563, 620, 644, 693, 725, 782, 806, 863, 887, 944, 968, 1025, 1049, 1106, 1130, 1187, 1206, 1268, 1292, 1349, 1373, 1422, 1454, 1511, 1535, 1592, 1616, 1673, 1697

Offset

1,1

Links

Table of n, a(n) for n=1..42.

Mathematica

Transpose[SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 9], {5, 8}]>0||SequenceCount[IntegerDigits[n, 9], {8, 5}]>0, 1, 0], {n, 2000}], {0, 1}]][[2]] (* The program uses the SequencePosition  and SequenceCount functions from Mathematica version 10 *) (* Harvey P. Dale, Dec 23 2015 *)

Crossrefs

Cf. A007095.

Sequence in context: A013538 A107309 A039389 * A043992 A032421 A129257

Adjacent sequences: A043209 A043210 A043211 * A043213 A043214 A043215

Keyword

nonn,base

Author

Clark Kimberling

Status

approved