a(n) = (Product k) * (Sum 1/k), where both the product and the sum are over those positive integers k, where k <= n and gcd(k,n) = 1.

A056855

a(n) = (Product k) * (Sum 1/k), where both the product and the sum are over those positive integers k, where k <= n and gcd(k,n) = 1.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =4a(4) =50a(5) =6a(6) =1764a(7) =176a(8) =4968a(9) =300a(10) =10628640a(11) =552a(12) =1486442880a(13) =34986a(14) =2024400a(15) =4098240a(17) =133542a(19) =16294800a(20) =121402713600a(21) =2612325870a(23) =61931424

External references