A164280 a(n) is the sum of the first A129749(n) nonprimes.

1, 64, 800, 1452, 207143, 14934568, 18656679, 42721785, 889239450, 1991045973, 6684665064, 11847007536, 127880982508860, 262907426075600, 435646635220423, 58536266213035868, 1777764795352216572, 5690843954660983949, 190101452851104748107, 71537286176000166753366

Offset: 1

Author

Klaus Brockhaus, Aug 11 2009

Keywords

• nonn

Comments

A variant of A050247 for nonprimes.

Examples

			A129749(4) = 44; sum of first 44 nonprimes is 1452, so a(4) = 1452.
		

Crossrefs

Cf. A129749, A050247, A018252, A160758.

Programs

Magma

S:=[]; a:=0; c:=0; for n in [1..20000000] do if not IsPrime(n) then a+:=n; c+:=1; if a mod c eq 0 then Append(~S, a); end if; end if; end for; S;

Formula

a(n) = sum_{i=1..A129749(n)} A018252(i).

Extensions

a(16)-a(19) from Donovan Johnson, Sep 19 2009

a(20) from Donovan Johnson, Jun 21 2011