a(n) = lcm(tau(n), sigma(n), pod(n)) / gcd(tau(n), sigma(n), pod(n)) where tau(k) is the number of divisors of k (A000005), sigma(k) is the sum of divisors of k (A000203) and pod(k) is the product of divisors of k (A007955).

A329929

a(n) = lcm(tau(n), sigma(n), pod(n)) / gcd(tau(n), sigma(n), pod(n)) where tau(k) is the number of divisors of k (A000005), sigma(k) is the sum of divisors of k (A000203) and pod(k) is the product of divisors of k (A007955).

Terms

    a(0) =1a(1) =6a(2) =12a(3) =168a(4) =30a(5) =9a(6) =56a(7) =960a(8) =351a(9) =450a(10) =132a(11) =6048a(12) =182a(13) =294a(14) =1800a(15) =158720a(16) =306a(17) =25272a(18) =380a(19) =84000a(20) =14112a(21) =1089a(22) =552a(23) =414720a(24) =11625a(25) =7098a(26) =29160a(27) =32928a(28) =870a(29) =101250

External references