a(1) = 7; a(n+1) = a(n)-th composite.

Terms

a(0) =7a(1) =14a(2) =24a(3) =36a(4) =52a(5) =74a(6) =100a(7) =133a(8) =174a(9) =222a(10) =284a(11) =356a(12) =442a(13) =543a(14) =665a(15) =805a(16) =969a(17) =1161a(18) =1383a(19) =1643a(20) =1939a(21) =2278a(22) =2665a(23) =3108a(24) =3614a(25) =4189a(26) =4840a(27) =5577a(28) =6412a(29) =7348