OFFSET
1,1
MATHEMATICA
SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 9], {6, 7}]>0||SequenceCount[ IntegerDigits[ n, 9], {7, 6}]>0, 1, 0], {n, 1700}], {1, 0}][[;; , 1]] (* Harvey P. Dale, Aug 13 2024 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
STATUS
approved