Denominator of Sum_{i = 1..n} (if(isprime(i), 0, 1/i)).

Terms

a(0) =1a(1) =1a(2) =1a(3) =4a(4) =4a(5) =12a(6) =12a(7) =24a(8) =72a(9) =360a(10) =360a(11) =360a(12) =360a(13) =2520a(14) =504a(15) =1008a(16) =1008a(17) =336a(18) =336a(19) =1680a(20) =1680a(21) =18480a(22) =18480a(23) =18480a(24) =92400a(25) =1201200a(26) =10810800a(27) =10810800a(28) =10810800a(29) =10810800