a(n) = 1 + Sum_{i=1..n} (p_i - 2)*(p_i#/p_i), where p_i stands for the i-th prime, and p_i# = A002110(i), the i-th primorial number.
A392860
a(n) = 1 + Sum_{i=1..n} (p_i - 2)*(p_i#/p_i), where p_i stands for the i-th prime, and p_i# = A002110(i), the i-th primorial number.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =21a(4) =171a(5) =2061a(6) =27471a(7) =477921a(8) =9156591a(9) =212850081a(10) =6236357571a(11) =193857461241
External references
- oeis: A392860