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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

Table of n, a(n) for n=0..104.

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-Fran├žois 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 October 18 10:10 EDT 2018. Contains 316320 sequences. (Running on oeis4.)