Integer averages of first n nonprime numbers for some n.

Terms

a(0) =1a(1) =8a(2) =25a(3) =33a(4) =359a(5) =2948a(6) =3291a(7) =4959a(8) =22350a(9) =33357a(10) =60907a(11) =80962a(12) =8276347a(13) =11856980a(14) =15254419a(15) =176009996a(16) =967538242a(17) =1729774831a(18) =9977169279a(19) =193005936726