OFFSET
1,1
MATHEMATICA
SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 7], {3, 1}]>0, 1, 0], {n, 2000}], {0, 1}][[;; , 2]] (* Harvey P. Dale, Feb 19 2024 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
STATUS
approved