Start with 2, then successively subtract the primes 3, 5, 7, ...

Terms

a(0) =2a(1) =-1a(2) =-6a(3) =-13a(4) =-24a(5) =-37a(6) =-54a(7) =-73a(8) =-96a(9) =-125a(10) =-156a(11) =-193a(12) =-234a(13) =-277a(14) =-324a(15) =-377a(16) =-436a(17) =-497a(18) =-564a(19) =-635a(20) =-708a(21) =-787a(22) =-870a(23) =-959a(24) =-1056a(25) =-1157a(26) =-1260a(27) =-1367a(28) =-1476a(29) =-1589