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 A241665 Number of iterations of A241663 needed to reach either 0 or 1. 2
 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 3, 1, 2, 1, 1, 1, 3, 1, 2, 1, 1, 1, 3, 1, 2, 1, 1, 1, 3, 1, 2, 1, 1, 1, 2, 1, 2, 1, 1, 1, 3, 1, 2, 1, 1, 1, 3, 1, 2, 1, 1, 1, 3, 1, 3, 1, 1, 1, 4, 1, 2, 1, 1, 1, 2, 1, 2, 1, 1, 1, 3, 1, 2, 1, 1, 1, 2, 1, 2, 1, 1, 1, 3, 1, 3, 1, 1, 1, 4, 1, 2, 1, 1, 1, 2, 1, 2, 1, 1, 1, 3, 1, 2, 1, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,7 COMMENTS It might be more natural to define the initial terms as a(0) = a(1) = 0 for the sake of recurrence. - Antti Karttunen, Oct 01 2018 LINKS Antti Karttunen, Table of n, a(n) for n = 1..65537 C. Defant, On Arithmetic Functions Related to Iterates of the Schemmel Totient Functions, J. Int. Seq. 18 (2015) # 15.2.1 Colin Defant, Python program EXAMPLE A241663(11)=7, A241663(7)=3, A241663(3)=0. Thus, a(11)=3. PROG (Python) See Defant link. Enter m=4, as well as starting and ending values of n. The third string of numbers will be this sequence. (PARI) A241663(n) = {my(f = factor(n)); prod(i=1, #f~, if ((f[i, 1] == 2) || (f[i, 1] == 3), 0, f[i, 1]^(f[i, 2]-1)*(f[i, 1]-4))); } \\ From A241663 A241665(n) = { my(s=(1==n)); while(n>1, n = A241663(n); s++); (s); }; \\ Antti Karttunen, Oct 01 2018 CROSSREFS Cf. A241663, A241668. Sequence in context: A101491 A276949 A205794 * A175307 A324825 A316557 Adjacent sequences:  A241662 A241663 A241664 * A241666 A241667 A241668 KEYWORD nonn AUTHOR Colin Defant, Apr 26 2014 EXTENSIONS More terms from Alois P. Heinz, Apr 30 2014 Terms a(88) .. a(105) from Antti Karttunen, Oct 01 2018 STATUS approved

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Last modified May 16 21:28 EDT 2021. Contains 343951 sequences. (Running on oeis4.)