A043998 Numbers k such that 0 and 3 occur juxtaposed in the base-10 representation of k but not of k+1.

30, 103, 130, 203, 230, 309, 330, 403, 430, 503, 530, 603, 630, 703, 730, 803, 830, 903, 930, 1003, 1039, 1103, 1130, 1203, 1230, 1309, 1330, 1403, 1430, 1503, 1530, 1603, 1630, 1703, 1730, 1803, 1830, 1903, 1930, 2003, 2039

Offset

1,1

Links

Michael De Vlieger, Table of n, a(n) for n = 1..10000

Mathematica

With[{j = 0, k = 3}, Position[Partition[Array[Boole[Total@ {SequenceCount[#, {j, k}], SequenceCount[#, {k, j}]} > 0] &@ IntegerDigits[#] &, 2100], 2, 1], {1, 0}][[All, 1]]] (* Michael De Vlieger, Aug 27 2021 *)
SequencePosition[Table[If[SequenceCount[IntegerDigits[n], {0, 3}]>0||SequenceCount[ IntegerDigits[ n], {3, 0}]>0, 1, 0], {n, 2100}], {1, 0}][[All, 1]] (* Harvey P. Dale, Jun 11 2022 *)

Crossrefs

Sequence in context: A280911 A043218 A039395 * A101056 A316362 A081370

Adjacent sequences: A043995 A043996 A043997 * A043999 A044000 A044001

Keyword

nonn,base

Author

Clark Kimberling

Status

approved