a(1) = 7; a(n+1) = a(n)-th nonprime, where nonprimes begin at 0.

Terms

a(0) =7a(1) =10a(2) =15a(3) =22a(4) =32a(5) =45a(6) =62a(7) =84a(8) =112a(9) =145a(10) =186a(11) =236a(12) =297a(13) =369a(14) =455a(15) =555a(16) =676a(17) =816a(18) =980a(19) =1172a(20) =1392a(21) =1650a(22) =1944a(23) =2282a(24) =2667a(25) =3108a(26) =3611a(27) =4184a(28) =4833a(29) =5566