OFFSET
1,1
MATHEMATICA
SequencePosition[Table[If[SequenceCount[IntegerDigits[n], {6, 7}]>0 || SequenceCount[ IntegerDigits[ n], {7, 6}]>0, 1, 0], {n, 2100}], {1, 0}][[;; , 1]] (* Harvey P. Dale, Mar 07 2024 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
STATUS
approved