Smallest prime p such that (2n)*p +1 and (p-1)/(2n) are prime, or 0 if no such prime exists.

Terms

a(0) =5a(1) =13a(2) =13a(3) =17a(4) =31a(5) =61a(6) =239a(7) =0a(8) =127a(9) =41a(10) =0a(11) =73a(12) =131a(13) =0a(14) =61a(15) =1889a(16) =0a(17) =397a(18) =419a(19) =0a(20) =211a(21) =89a(22) =0a(23) =97a(24) =101a(25) =0a(26) =163a(27) =113a(28) =0a(29) =181