Successive sums of consecutive primes that form a triangular grid.

Terms

a(0) =2a(1) =10a(2) =41a(3) =129a(4) =328a(5) =712a(6) =1371a(7) =2427a(8) =4028a(9) =6338a(10) =9523a(11) =13887a(12) =19580a(13) =26940a(14) =36227a(15) =47721a(16) =61910a(17) =79168a(18) =99685a(19) =124211a(20) =153178a(21) =186914a(22) =225831a(23) =271061a(24) =322858a(25) =382038a(26) =448869a(27) =524451a(28) =608914a(29) =704204