login
A262518
Even bisection of A155043.
7
0, 1, 2, 2, 3, 3, 3, 4, 5, 4, 5, 5, 6, 6, 6, 6, 7, 7, 10, 8, 8, 8, 9, 9, 9, 10, 10, 10, 10, 11, 10, 12, 19, 12, 13, 13, 11, 14, 14, 14, 14, 15, 12, 16, 15, 15, 17, 16, 13, 18, 19, 17, 14, 18, 14, 18, 18, 19, 19, 20, 15, 21, 21, 20, 16, 22, 16, 23, 17, 23, 17, 24, 24, 25, 25, 24, 25, 26, 25, 27, 26, 26, 28, 27, 26, 27, 28, 28, 28, 29, 27, 29, 29
OFFSET
0,3
COMMENTS
Number of steps needed to reach zero when starting from k = 2*n and repeatedly applying the map that replaces k by k - d(k), where d(k) is the number of divisors of k (A000005).
LINKS
FORMULA
a(n) = A155043(2*n).
PROG
(Scheme) (define (A262518 n) (A155043 (+ n n)))
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Oct 02 2015
STATUS
approved