a(n) = (Sum 1/k) (Product k), where both the sum and product are over those k where 1 <= k <= n/2 and gcd(k,n) = 1.
A099001
a(n) = (Sum 1/k) (Product k), where both the sum and product are over those k where 1 <= k <= n/2 and gcd(k,n) = 1.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =3a(4) =1a(5) =11a(6) =4a(7) =14a(8) =4a(9) =274a(10) =6a(11) =1764a(12) =23a(13) =106a(14) =176a(15) =109584a(16) =47a(17) =1026576a(18) =300a(19) =6960a(20) =1689a(21) =120543840a(22) =552a(23) =26854848a(24) =19524a(25) =7962160a(26) =34986a(27) =283465647360a(28) =1312a(30) =4098240
External references
- oeis: A099001