Sum of the first n twin prime pairs.

Terms

a(0) =8a(1) =20a(2) =44a(3) =80a(4) =140a(5) =224a(6) =344a(7) =488a(8) =692a(9) =908a(10) =1184a(11) =1484a(12) =1844a(13) =2228a(14) =2624a(15) =3080a(16) =3560a(17) =4100a(18) =4664a(19) =5288a(20) =5984a(21) =6824a(22) =7688a(23) =8612a(24) =9656a(25) =10796a(26) =11996a(27) =13232a(28) =14516a(29) =15836