a(n) = Sum_{k=1..n} prime(k)^2*floor(n/prime(k)) .

Terms

a(0) =0a(1) =4a(2) =13a(3) =17a(4) =42a(5) =55a(6) =104a(7) =108a(8) =117a(9) =146a(10) =267a(11) =280a(12) =449a(13) =502a(14) =536a(15) =540a(16) =829a(17) =842a(18) =1203a(19) =1232a(20) =1290a(21) =1415a(22) =1944a(23) =1957a(24) =1982a(25) =2155a(26) =2164a(27) =2217a(28) =3058a(29) =3096