a(n) = lcm(sigma(n), pod(n)) / n, where sigma (k) = the sum of divisors of k (A000203) and pod(n) = the product of divisors of k (A007955).

A307893

a(n) = lcm(sigma(n), pod(n)) / n, where sigma (k) = the sum of divisors of k (A000203) and pod(n) = the product of divisors of k (A007955).

Terms

    a(0) =1a(1) =3a(2) =4a(3) =14a(4) =6a(5) =6a(6) =8a(7) =120a(8) =39a(9) =90a(10) =12a(11) =1008a(12) =14a(13) =84a(14) =120a(15) =1984a(16) =18a(17) =4212a(18) =20a(19) =8400a(20) =672a(21) =198a(22) =24a(23) =69120a(24) =155a(25) =546a(26) =1080a(27) =784a(28) =30a(29) =27000

External references