a(n) = Product of (prime + 1) for first n primes - primorial (n); Sum of proper divisors of the n-th primorial.
A074107
a(n) = Product of (prime + 1) for first n primes - primorial (n); Sum of proper divisors of the n-th primorial.
Terms
- a(0) =0a(1) =1a(2) =6a(3) =42a(4) =366a(5) =4602a(6) =66738a(7) =1231314a(8) =25136790a(9) =612982650a(10) =18612572370a(11) =602072009070
External references
- oeis: A074107