OFFSET
0,3
COMMENTS
This sequence is similar to A055642; here we consider decimal expansions, there binary expansions.
LINKS
Rémy Sigrist, PARI program for A345672
FORMULA
a(n) <= n.
a(n) = 1 iff n belongs to A252043.
EXAMPLE
For n = 21:
- the decimal expansion of 21 first appears in the concatenation of 12 and 13,
- so a(21) = 12.
PROG
(PARI) See Links section.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Rémy Sigrist, Jun 22 2021
STATUS
approved