a(n) = numerator of Product_{d|n} (sigma(d)/d) where sigma(k) = the sum of the divisors of k (A000203).
A322673
a(n) = numerator of Product_{d|n} (sigma(d)/d) where sigma(k) = the sum of the divisors of k (A000203).
Terms
- a(0) =1a(1) =3a(2) =4a(3) =21a(4) =6a(5) =4a(6) =8a(7) =315a(8) =52a(9) =81a(10) =12a(11) =49a(12) =14a(13) =144a(14) =64a(15) =9765a(16) =18a(17) =338a(18) =20a(19) =11907a(20) =1024a(21) =324a(22) =24a(23) =1225a(24) =186a(25) =441a(26) =2080a(27) =72a(28) =30a(29) =20736
External references
- oeis: A322673