274428domain: NAppears in sequencesa(n) = n/(Sum_{k=1..n} 1/phi(A341813(n)*k)).at n=32A341814Positions of zeros in A346246.at n=6A346251a(n) is the conjectured largest number such that both a(n) and a(n) - n are 11-smooth numbers, or 0 if no such number exists. a(n) can be less than n.at n=27A392256