a(1) = 5; a(n+1) = a(n)-th nonprime, where nonprimes begin at 0.

Terms

a(0) =5a(1) =8a(2) =12a(3) =18a(4) =26a(5) =36a(6) =50a(7) =68a(8) =91a(9) =120a(10) =155a(11) =200a(12) =253a(13) =318a(14) =394a(15) =485a(16) =591a(17) =717a(18) =866a(19) =1040a(20) =1242a(21) =1474a(22) =1744a(23) =2052a(24) =2408a(25) =2816a(26) =3277a(27) =3805a(28) =4403a(29) =5080