a(n) is the least number k such that there are exactly n pairs (p,q) of primes with p<q such that p+q = 2*k and that 2*k+p, 2*k+q, p*q-2*k and p*q+2*k are primes.

A354462

a(n) is the least number k such that there are exactly n pairs (p,q) of primes with p<q such that p+q = 2*k and that 2*k+p, 2*k+q, p*q-2*k and p*q+2*k are primes.

Terms

    a(0) =1a(1) =4a(2) =15a(3) =315a(4) =420a(5) =825a(6) =2310a(7) =3150a(8) =1785a(9) =8925a(10) =6090a(11) =6405a(12) =8610a(13) =24990a(14) =19305a(15) =12705a(16) =14175a(17) =15015a(18) =18165a(19) =19635a(20) =24255a(21) =48510a(22) =63525a(23) =33915a(24) =48195a(25) =54285a(26) =35490a(27) =50505a(28) =55650a(29) =69615

External references