Sum of even-indexed primes.

Terms

a(0) =3a(1) =10a(2) =23a(3) =42a(4) =71a(5) =108a(6) =151a(7) =204a(8) =265a(9) =336a(10) =415a(11) =504a(12) =605a(13) =712a(14) =825a(15) =956a(16) =1095a(17) =1246a(18) =1409a(19) =1582a(20) =1763a(21) =1956a(22) =2155a(23) =2378a(24) =2607a(25) =2846a(26) =3097a(27) =3360a(28) =3631a(29) =3912