%I
%S 1,3,6,10,15,20,27,35,44,53,64,75,88,101,114,130,147,164,183,202,221,
%T 240,263,286,311,336,363,390,419,448,479,511,543,575,607,639,676,713,
%U 750,787,828,869,912,955,998
%N Cumulative sum of largest prime power <= n.
%C Integers in this sequence which are themselves primes include a(2) = 3, a(10) = 53, a(14) = 101, a(23) = 263, a(25) = 311, a(29) = 419, a(31) = 479, a(35) = 607, a(40) = 787. Integers in this sequence which are themselves powers greater than 1 of primes include a(7) = 27, a(11) = 64. Integers in this sequence which are perfect powers greater than 1 of composites include a(37) = 676.
%F a(n) = Sum_{i=1..n} A031218(i).
%Y Cf. A031218.
%K easy,nonn
%O 1,2
%A _Jonathan Vos Post_, Aug 26 2005
