OFFSET
1,1
LINKS
Michael De Vlieger, Table of n, a(n) for n = 1..10000
MATHEMATICA
SequencePosition[Table[If[SequenceCount[IntegerDigits[n], {1, 7}]>0 || SequenceCount[ IntegerDigits[n], {7, 1}]>0, 1, 0], {n, 2100}], {1, 0}][[All, 1]] (* Harvey P. Dale, Apr 11 2022 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
STATUS
approved