A213725 - OEIS

A213725

a(n)=0 if n is in the infinite trunk of Carl White's beanstalk (i.e., in A179016), otherwise 1 + number of steps to reach the farthest leaf in that finite branch of the beanstalk.

0, 0, 1, 0, 0, 1, 1, 0, 0, 1, 2, 0, 1, 1, 1, 0, 0, 1, 2, 0, 1, 1, 3, 0, 1, 2, 0, 1, 1, 1, 1, 0, 0, 1, 2, 0, 1, 1, 3, 0, 1, 2, 0, 1, 1, 1, 0, 4, 1, 0, 3, 1, 1, 0, 2, 1, 2, 0, 1, 1, 1, 1, 1, 0, 0, 1, 2, 0, 1, 1, 3, 0, 1, 2, 0, 1, 1, 1, 0, 4, 1, 0, 3, 1, 1, 0, 2

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OFFSET

0,11

LINKS

Antti Karttunen, Table of n, a(n) for n = 0..16384

FORMULA

If A079559(n)=0, a(n)=1; otherwise, if A213719(n)=1, a(n)=0; otherwise a(n) = 1+max(a(A213723(n)), a(A213724(n))),

PROG

(Scheme with memoization-macro definec): (definec (A213725 n) (cond ((zero? (A079559 n)) 1) ((not (zero? (A213719 n))) 0) (else (1+ (max (A213725 (A213723 n)) (A213725 (A213724 n)))))))

CROSSREFS

Differs from A213726 for the first time at n=208, where a(n)=5, while A213726(208)=6.

For all n, a(A179016(n)) = 0, a(A055938(n)) = 1, and a(A213717(n)) >= 2. Cf. A213726, A213727-A213731.

Sequence in context: A102550 A293139 A351319 * A213726 A116929 A059984

Adjacent sequences: A213722 A213723 A213724 * A213726 A213727 A213728

KEYWORD

nonn

AUTHOR

Antti Karttunen, Nov 01 2012

STATUS

approved