a(1)=1. a(n) = a(n-1) + (sum of terms, from among terms a(1) through a(n-1), which are prime or 1).

Terms

a(0) =1a(1) =2a(2) =5a(3) =13a(4) =34a(5) =55a(6) =76a(7) =97a(8) =215a(9) =333a(10) =451a(11) =569a(12) =1256a(13) =1943a(14) =2630a(15) =3317a(16) =4004a(17) =4691a(18) =10069a(19) =25516a(20) =40963a(21) =56410a(22) =71857a(23) =87304a(24) =102751a(25) =118198a(26) =133645a(27) =149092a(28) =164539a(29) =179986