Sum of primes <= n.

Terms

a(0) =0a(1) =2a(2) =5a(3) =5a(4) =10a(5) =10a(6) =17a(7) =17a(8) =17a(9) =17a(10) =28a(11) =28a(12) =41a(13) =41a(14) =41a(15) =41a(16) =58a(17) =58a(18) =77a(19) =77a(20) =77a(21) =77a(22) =100a(23) =100a(24) =100a(25) =100a(26) =100a(27) =100a(28) =129a(29) =129