a(n) = Product_{d|n, d-1 is prime} (d-1)^(1+A286561(n,d-1)), where A286561(n,k) gives the k-valuation of n (for k > 1).
A323155
a(n) = Product_{d|n, d-1 is prime} (d-1)^(1+A286561(n,d-1)), where A286561(n,k) gives the k-valuation of n (for k > 1).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =1a(5) =20a(6) =1a(7) =21a(8) =2a(9) =1a(10) =1a(11) =3960a(12) =1a(13) =13a(14) =2a(15) =21a(16) =1a(17) =340a(18) =1a(19) =57a(20) =2a(21) =1a(22) =1a(23) =1275120a(24) =1a(25) =1a(26) =2a(27) =39a(28) =1a(29) =2900
External references
- oeis: A323155