Numbers k such that 2*k!! - 1 is prime.

Terms

a(0) =2a(1) =3a(2) =5a(3) =9a(4) =11a(5) =13a(6) =25a(7) =35a(8) =46a(9) =56a(10) =68a(11) =69a(12) =71a(13) =84a(14) =92a(15) =103a(16) =110a(17) =121a(18) =193a(19) =259a(20) =308a(21) =368a(22) =406a(23) =426a(24) =620a(25) =627a(26) =1206a(27) =1631a(28) =1845a(29) =2108