a(n+1) = a(n)-th composite number, with a(0) = 1.

Terms

a(0) =1a(1) =4a(2) =9a(3) =16a(4) =26a(5) =39a(6) =56a(7) =78a(8) =106a(9) =141a(10) =184a(11) =236a(12) =299a(13) =374a(14) =465a(15) =570a(16) =696a(17) =843a(18) =1014a(19) =1212a(20) =1441a(21) =1708a(22) =2014a(23) =2365a(24) =2769a(25) =3226a(26) =3749a(27) =4343a(28) =5016a(29) =5774