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 A260712 Number of iterations of A234742 needed when started from n before a fixed point is reached. 9
 0, 0, 0, 0, 6, 0, 0, 0, 5, 6, 0, 0, 0, 0, 5, 0, 4, 5, 0, 6, 4, 0, 55, 0, 0, 0, 4, 0, 141, 5, 0, 0, 140, 4, 1, 5, 0, 0, 54, 6, 0, 4, 2, 0, 145, 55, 0, 0, 3, 0, 6, 0, 2, 4, 0, 0, 1, 141, 0, 5, 0, 0, 3, 0, 2, 140, 0, 4, 4, 1, 4, 5, 0, 0, 1, 0, 2, 54, 5, 6, 3, 0, 3, 4, 4, 2, 0, 0, 4, 145, 0, 55, 139, 0, 1, 0, 0, 3, 53, 0, 3, 6, 0, 0, 3, 2, 14, 4, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 COMMENTS The fixed points of A234742 are in A235035, thus the latter gives the zeros of this sequence. It is not known whether the sequence is well-defined for all values. For example, does a(455) or a(1361) have a finite value? Cf. sequences A260735 and A260441. LINKS Antti Karttunen, Table of n, a(n) for n = 1..454 FORMULA If A234742(n) = n, then a(n) = 0, otherwise a(n) = 1 + a(A234742(n)). Other identities: a(A235035(n)) = 0. a(2n) = a(n). PROG (PARI) allocatemem((2^30)); A234742(n) = factorback(subst(lift(factor(Mod(1, 2)*Pol(binary(n)))), x, 2)); \\ After M. F. Hasler's Feb 18 2014 code. A260712(n) = {my(prev=-1, i=-1); until((n==prev), prev = n; n = A234742(n); i++); return(i); }; for(n=1, 454, write("b260712.txt", n, " ", A260712(n))); (Scheme, two alternatives, the first one using memoizing definec-macro) (definec (A260712 n) (let ((next (A234742 n))) (if (= next n) 0 (+ 1 (A260712 next))))) (define (A260712loop n) (let loop ((n (A234742 n)) (prev_n n) (i 0)) (if (= n prev_n) i (loop (A234742 n) n (+ 1 i))))) CROSSREFS Cf. A235035 (gives the positions of zeros). Cf. A234742, A260735, A260735, A260441. Subsequences: A260713, A260716. Sequence in context: A226784 A281319 A174431 * A173066 A173452 A282212 Adjacent sequences:  A260709 A260710 A260711 * A260713 A260714 A260715 KEYWORD nonn AUTHOR Antti Karttunen, Aug 04 2015 STATUS approved

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Last modified April 4 05:34 EDT 2020. Contains 333212 sequences. (Running on oeis4.)