OFFSET
1,1
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
Tanya Khovanova, Non Recursions
MATHEMATICA
SequencePosition[Table[If[SequenceCount[IntegerDigits[n, 7], {6, 6}]>0, 1, 0], {n, 2500}], {1, 0}][[All, 1]] (* Harvey P. Dale, Aug 20 2021 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
EXTENSIONS
Incorrect Mathematica program deleted by Harvey P. Dale, Aug 20 2021
STATUS
approved