Partial sums of Chen primes (starting with 1).

Terms

a(0) =1a(1) =3a(2) =6a(3) =11a(4) =18a(5) =29a(6) =42a(7) =59a(8) =78a(9) =101a(10) =130a(11) =161a(12) =198a(13) =239a(14) =286a(15) =339a(16) =398a(17) =465a(18) =536a(19) =619a(20) =708a(21) =809a(22) =916a(23) =1025a(24) =1138a(25) =1265a(26) =1396a(27) =1533a(28) =1672a(29) =1821