A043980 Numbers k such that 2 and 8 occur juxtaposed in the base-9 representation of k but not of k+1.

26, 74, 107, 155, 188, 242, 269, 317, 350, 398, 431, 479, 512, 560, 593, 641, 674, 722, 755, 803, 836, 884, 917, 971, 998, 1046, 1079, 1127, 1160, 1208, 1241, 1289, 1322, 1370, 1403, 1451, 1484, 1532, 1565, 1613, 1646, 1700

Offset

1,1

Links

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

Mathematica

SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 9], {2, 8}]>0  || SequenceCount[IntegerDigits[n, 9], {8, 2}]>0, 1, 0], {n, 2000}], {1, 0}][[All, 1]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, May 18 2021 *)

Crossrefs

Cf. A007095.

Sequence in context: A299798 A039377 A043200 * A351538 A065302 A353635

Adjacent sequences: A043977 A043978 A043979 * A043981 A043982 A043983

Keyword

nonn,base

Author

Clark Kimberling

Status

approved