OFFSET
1,1
MATHEMATICA
SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 7], {3, 6}]>0, 1, 0], {n, 1800}], {1, 0}][[;; , 1]] (* Harvey P. Dale, Jul 10 2024 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
STATUS
approved