Primes p such that q=2*p^3-1, r=2*p*q^2-1, and s=2*p*r^2-1 are all prime.

Terms

a(0) =27361a(1) =65731a(2) =167623a(3) =424093a(4) =1559449a(5) =2389693a(6) =3880633a(7) =4683661a(8) =5755921a(9) =5780881a(10) =6124411a(11) =6840643a(12) =7802959a(13) =7822879a(14) =7917769a(15) =8876719a(16) =9488683a(17) =9640321a(18) =9966139a(19) =10392073a(20) =10865083a(21) =10988743a(22) =12363991a(23) =12457681a(24) =12756253a(25) =13471561a(26) =14437561a(27) =14508709a(28) =14550331a(29) =14839711