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A261226 a(n) = number of steps to reach 0 when starting from k = n and repeatedly applying the map that replaces k with k - A055401(k), where A055401(k) = the number of positive cubes needed to sum to k using the greedy algorithm. 7
0, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 13, 13, 13, 13, 14, 14, 14, 15, 15, 15, 15, 15, 15, 15, 15, 16 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,9
LINKS
FORMULA
a(0) = 0; for n >= 1, a(n) = 1 + a(A261225(n)).
PROG
(Scheme) (definec (A261226 n) (if (zero? n) n (+ 1 (A261226 (A261225 n)))))
CROSSREFS
Cf. also A261221.
After a(0) differs from A003108 for the first time at n=32, where a(32)=5, while A003108(32)=6.
Sequence in context: A110656 A104407 A054897 * A003108 A279223 A214956
KEYWORD
nonn
AUTHOR
Antti Karttunen, Aug 16 2015
STATUS
approved

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Last modified May 20 10:39 EDT 2024. Contains 372712 sequences. (Running on oeis4.)