a(n) = numerator of Product_{d|n} (sigma(d)/tau(d)) where sigma(k) = the sum of the divisors of k (A000203) and tau(k) = the number of divisors of k (A000005).
A324509
a(n) = numerator of Product_{d|n} (sigma(d)/tau(d)) where sigma(k) = the sum of the divisors of k (A000203) and tau(k) = the number of divisors of k (A000005).
Terms
- a(0) =1a(1) =3a(2) =2a(3) =7a(4) =3a(5) =9a(6) =4a(7) =105a(8) =26a(9) =81a(10) =6a(11) =98a(12) =7a(13) =36a(14) =36a(15) =651a(16) =9a(17) =507a(18) =10a(19) =1323a(20) =64a(21) =81a(22) =12a(23) =11025a(24) =31a(25) =441a(26) =260a(27) =784a(28) =15a(29) =6561
External references
- oeis: A324509