Semiprimes pq with pq - 1 divisible by p + q.

Terms

a(0) =6a(1) =21a(2) =301a(3) =697a(4) =1333a(5) =1909a(6) =2041a(7) =3901a(8) =24601a(9) =26977a(10) =96361a(11) =130153a(12) =163201a(13) =250321a(14) =275833a(15) =296341a(16) =389593a(17) =486877a(18) =495529a(19) =542413a(20) =808861a(21) =1005421a(22) =1005649a(23) =1055833a(24) =1063141a(25) =1232053a(26) =1284121a(27) =1403221a(28) =1618597a(29) =1787917