Sum of the first n Sophie Germain primes.

Terms

a(0) =2a(1) =5a(2) =10a(3) =21a(4) =44a(5) =73a(6) =114a(7) =167a(8) =250a(9) =339a(10) =452a(11) =583a(12) =756a(13) =935a(14) =1126a(15) =1359a(16) =1598a(17) =1849a(18) =2130a(19) =2423a(20) =2782a(21) =3201a(22) =3632a(23) =4075a(24) =4566a(25) =5075a(26) =5668a(27) =6309a(28) =6962a(29) =7621