a(n) = Sum_{d|n} (sigma(d)*pod(d)) where sigma(k) = the sum of the divisors of k (A000203) and pod(k) = the product of the divisors of k (A007955).

A325029

a(n) = Sum_{d|n} (sigma(d)*pod(d)) where sigma(k) = the sum of the divisors of k (A000203) and pod(k) = the product of the divisors of k (A007955).

Terms

    a(0) =1a(1) =7a(2) =13a(3) =63a(4) =31a(5) =451a(6) =57a(7) =1023a(8) =364a(9) =1837a(10) =133a(11) =48891a(12) =183a(13) =4767a(14) =5443a(15) =32767a(16) =307a(17) =228250a(18) =381a(19) =337893a(20) =14181a(21) =17563a(22) =553a(23) =19956411a(24) =3906a(25) =28581a(26) =29524a(27) =1234135a(28) =871a(29) =58327681

External references