OFFSET
1,3
COMMENTS
Each k occurs exactly twice, at 2k and at A305421(k).
LINKS
FORMULA
a(n) = n/2 if n is even, a(n) = A305422(n) if n is odd.
PROG
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jun 08 2018
STATUS
approved