a(n) = sum of the first n lower twin primes.

Terms

a(0) =3a(1) =8a(2) =19a(3) =36a(4) =65a(5) =106a(6) =165a(7) =236a(8) =337a(9) =444a(10) =581a(11) =730a(12) =909a(13) =1100a(14) =1297a(15) =1524a(16) =1763a(17) =2032a(18) =2313a(19) =2624a(20) =2971a(21) =3390a(22) =3821a(23) =4282a(24) =4803a(25) =5372a(26) =5971a(27) =6588a(28) =7229a(29) =7888