a(n) = (A000111(2*p) - 1)/(2*p), where p = A000040(n) = prime(n).
A180419
a(n) = (A000111(2*p) - 1)/(2*p), where p = A000040(n) = prime(n).
Terms
- a(0) =1a(1) =10a(2) =5052a(3) =14240070
External references
- oeis: A180419
A180419
a(n) = (A000111(2*p) - 1)/(2*p), where p = A000040(n) = prime(n).