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 A072643 Half of the binary width of the terms of A014486, the number of digits in A063171(n)/2. 30
 0, 1, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS MATHEMATICA a[n_] := Module[{i, c, a}, i = c = 0; a = 1; While[n>c, a *= (4*i+2)/(i+2); i++; c += a]; i]; Table[a[n], {n, 0, 104}] (* Jean-François Alcover, Dec 26 2017, from Sage code *) PROG (Sage) def A072643(n) :     i = c = 0; a = 1     while n > c :         a *= (4*i+2)/(2+i)         i += 1; c += a     return i [A072643(n) for n in (0..100)] # Peter Luschny, Sep 07 2012 CROSSREFS Each value v occurs A000108(v) times. The maximum position for value v to occur is A014138(v). Permutations: A071673, A072644, A072645, A072660. Cf. also A002024, A072649. Sequence in context: A084320 A161358 A120699 * A130260 A276621 A111393 Adjacent sequences:  A072640 A072641 A072642 * A072644 A072645 A072646 KEYWORD nonn AUTHOR Antti Karttunen, Jun 02 2002 STATUS approved

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Last modified September 18 20:19 EDT 2020. Contains 337173 sequences. (Running on oeis4.)