n copies of n-th prime.

Terms

a(0) =2a(1) =3a(2) =3a(3) =5a(4) =5a(5) =5a(6) =7a(7) =7a(8) =7a(9) =7a(10) =11a(11) =11a(12) =11a(13) =11a(14) =11a(15) =13a(16) =13a(17) =13a(18) =13a(19) =13a(20) =13a(21) =17a(22) =17a(23) =17a(24) =17a(25) =17a(26) =17a(27) =17a(28) =19a(29) =19