a(n) = Product_{d|n} (tau(d)*sigma(d)) where tau(k) = the number of divisors of k (A000005) and sigma(k) = the sum of the divisors of k (A000203).
A324987
a(n) = Product_{d|n} (tau(d)*sigma(d)) where tau(k) = the number of divisors of k (A000005) and sigma(k) = the sum of the divisors of k (A000203).
Terms
- a(0) =1a(1) =6a(2) =8a(3) =126a(4) =12a(5) =2304a(6) =16a(7) =7560a(8) =312a(9) =5184a(10) =24a(11) =8128512a(12) =28a(13) =9216a(14) =9216a(15) =1171800a(16) =36a(17) =21026304a(18) =40a(19) =27433728a(20) =16384a(21) =20736a(22) =48a(23) =234101145600a(24) =1116a(25) =28224a(26) =49920a(27) =65028096a(28) =60a(29) =110075314176
External references
- oeis: A324987