OFFSET
1,1
MATHEMATICA
SequencePosition[Table[If[SequenceCount[IntegerDigits[n], {7, 4}]>0, 1, 0], {n, 4000}], {1, 0}][[All, 1]] (* Harvey P. Dale, Dec 09 2022 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
STATUS
approved