a(1) = 2; for n > 1, a(n) = a(n-1)*prime(n) if a(n-1)<=prime(n), otherwise a(n) = a(n-1)-prime(n).

Terms

a(0) =2a(1) =6a(2) =1a(3) =7a(4) =77a(5) =64a(6) =47a(7) =28a(8) =5a(9) =145a(10) =114a(11) =77a(12) =36a(13) =1548a(14) =1501a(15) =1448a(16) =1389a(17) =1328a(18) =1261a(19) =1190a(20) =1117a(21) =1038a(22) =955a(23) =866a(24) =769a(25) =668a(26) =565a(27) =458a(28) =349a(29) =236