Odd primes p such that q = (k*p+1)/(p-k) is prime for some p/2 < k < p.

Terms

a(0) =3a(1) =7a(2) =13a(3) =17a(4) =23a(5) =31a(6) =47a(7) =53a(8) =67a(9) =73a(10) =79a(11) =113a(12) =137a(13) =139a(14) =151a(15) =157a(16) =163a(17) =173a(18) =193a(19) =227a(20) =257a(21) =293a(22) =307a(23) =317a(24) =337a(25) =349a(26) =353a(27) =379a(28) =401a(29) =419