Smallest prime q such that 2*prime(n)*q^prime(n)-1 is also prime.

Terms

a(0) =2a(1) =5a(2) =43a(3) =1409a(4) =19a(5) =107a(6) =31a(7) =653a(8) =521a(9) =1033a(10) =661a(11) =479a(12) =787a(13) =2063a(14) =1307a(15) =5477a(16) =1471a(17) =823a(18) =1163a(19) =1489a(20) =6991a(21) =9437a(22) =1019a(23) =6073a(24) =17a(25) =2089a(26) =9413a(27) =79a(28) =3137a(29) =12781