a(n) is the smallest k >= n such that prime(n)*prime(k) - prime(n+k) is a perfect square.

Terms

a(0) =1a(1) =3a(2) =5a(3) =57a(4) =99a(5) =10a(6) =30a(7) =17a(8) =28a(9) =91a(10) =398a(11) =2638a(12) =292a(13) =1383a(14) =69a(15) =1055a(16) =860a(17) =679a(18) =10782a(19) =5440a(20) =1630a(21) =997a(22) =640a(23) =34a(24) =186a(25) =1248a(26) =102a(27) =2039a(28) =1457a(29) =95