a(n) = Chowla's function of n * sigma(n).

Terms

a(0) =0a(1) =0a(2) =0a(3) =14a(4) =0a(5) =60a(6) =0a(7) =90a(8) =39a(9) =126a(10) =0a(11) =420a(12) =0a(13) =216a(14) =192a(15) =434a(16) =0a(17) =780a(18) =0a(19) =882a(20) =320a(21) =468a(22) =0a(23) =2100a(24) =155a(25) =630a(26) =480a(27) =1512a(28) =0a(29) =2952