cp's OEIS Frontend

A369247 Number of representations of 3*A057588(n) as a sum (p*q + p*r + q*r) with three odd primes p <= q <= r, where A057588 is Kummer numbers, one less than primorials.

%I A369247 #9 Jan 23 2024 16:23:08
%S A369247 0,0,1,3,2,6,10,12,50,178,150
%N A369247 Number of representations of 3*A057588(n) as a sum (p*q + p*r + q*r) with three odd primes p <= q <= r, where A057588 is Kummer numbers, one less than primorials.
%F A369247 a(n) = A369054(3*(A002110(n)-1)).
%o A369247 (PARI)
%o A369247 \\ Needs also program from A369054:
%o A369247 A002110(n) = prod(i=1,n,prime(i));
%o A369247 A369247(n) = A369054(3*(A002110(n)-1));
%Y A369247 Cf. A002110, A057588, A369054.
%K A369247 nonn,hard,more
%O A369247 1,4
%A A369247 _Antti Karttunen_, Jan 22 2024