Sophie Germain primes in A154939.

Terms

a(0) =3a(1) =5a(2) =11a(3) =131a(4) =419a(5) =1409a(6) =2069a(7) =3449a(8) =3761a(9) =3911a(10) =6899a(11) =7079a(12) =7151a(13) =9539a(14) =9791a(15) =10529a(16) =10691a(17) =11321a(18) =11831a(19) =14741a(20) =15269a(21) =17291a(22) =22079a(23) =27281a(24) =27809a(25) =30449a(26) =34439a(27) =45131a(28) =48479a(29) =52289