OFFSET
1,1
MATHEMATICA
SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 9], {2, 7}]>0 || SequenceCount[ IntegerDigits[n, 9], {7, 2}]>0 , 1, 0], {n, 1700}], {1, 0}][[All, 1]] (* Harvey P. Dale, Aug 29 2022 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
STATUS
approved