A113489 - OEIS

%I #31 Sep 27 2016 13:09:18

%S 129,3682913,496165411,62260698721,7472966967499,99262851056183695,

%T 1234379338586942892505,135436174616790289414111,

%U 14738971133550183905879827,1593061976858155930556059673,171191473337951767580578821529,18305009217958957209544913346089

%N Composite numbers of the form "Sum of the first 10^k primes".

%H David Baugh, <a href="/A113489/b113489.txt">Table of n, a(n) for n = 1..18</a>

%e The first 10^10 primes add up to 1234379338586942892505, which is composite.

%t Select[{ (* list A099824 *) }, ! PrimeQ[#] &] (* _Robert G. Wilson v_, Jan 14 2006 *)

%Y Composite terms of A099824.

%K nonn

%O 1,1

%A _Cino Hilliard_, Jan 09 2006

%E Terms a(8) and beyond from _David Baugh_, Sep 27 2016