a(n) = Sum_{k=1..n} prime(k)*floor(n/prime(k)).

Terms

a(0) =0a(1) =0a(2) =2a(3) =5a(4) =7a(5) =12a(6) =17a(7) =24a(8) =26a(9) =29a(10) =36a(11) =47a(12) =52a(13) =65a(14) =74a(15) =82a(16) =84a(17) =101a(18) =106a(19) =125a(20) =132a(21) =142a(22) =155a(23) =178a(24) =183a(25) =188a(26) =203a(27) =206a(28) =215a(29) =244