a(n) = Sum_{p|n, p prime} p * sigma_p(p).

Terms

a(0) =0a(1) =10a(2) =84a(3) =10a(4) =15630a(5) =94a(6) =5764808a(7) =10a(8) =84a(9) =15640a(11) =94a(13) =5764818a(14) =15714a(15) =10a(17) =94a(19) =15640a(20) =5764892a(23) =94a(24) =15630