OFFSET
1,1
MATHEMATICA
SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 9], {1, 3}]>0 || SequenceCount[ IntegerDigits[n, 9], {3, 1}]>0, 1, 0], {n, 1800}], {1, 0}][[All, 1]] (* Harvey P. Dale, Feb 05 2023 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
STATUS
approved