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Numbers of primes n needed to sum to semiprime without multiplicity.
0

%I #2 Mar 30 2012 18:40:00

%S 2,3,4,6,5,8,7

%N Numbers of primes n needed to sum to semiprime without multiplicity.

%e a(3)=4 because 2*7=14=2+2+5+5;

%e a(4)=6 because 3*5=15=2+2+2+3+3+3.

%Y Cf. A001358.

%K nonn

%O 1,1

%A _Giovanni Teofilatto_, Apr 21 2005