A071640 - OEIS

A071640

a(n) = Sum_{i=1..n} A040051(i).

1, 1, 2, 3, 4, 5, 6, 6, 6, 6, 6, 7, 8, 9, 9, 10, 11, 12, 12, 13, 13, 13, 14, 15, 15, 15, 15, 15, 16, 16, 16, 17, 18, 18, 19, 20, 21, 22, 23, 23, 24, 24, 25, 26, 26, 26, 26, 27, 28, 28, 29, 30, 31, 32, 32, 33, 33, 33, 33, 34, 35, 35, 36, 36, 36, 36, 37, 38, 39, 39, 40, 41, 42, 42

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,3

COMMENTS

Does 2*a(n) > n for n>2? Cf. A086144. - Benoit Cloitre

No. First failure is at n = 6662. - Peter Luschny, Oct 05 2011

LINKS

T. D. Noe, Table of n, a(n) for n = 1..1000

MAPLE

A071640 := proc(n) option remember; if n=1 then 1 else A071640(n-1)+

(combinat[numbpart](n) mod 2) fi end: # Peter Luschny, Oct 05 2011

MATHEMATICA