142187domain: NAppears in sequencesLeast k such that Sum_{i=1..k} 1/phi(i) >= n.at n=22A074467a(n) = 169*n^2 + 2*n.at n=28A158220Number of Carlitz compositions of n that either have length 1, or have length greater than or equal to 2 and are palindromic if we exclude the first part.at n=40A291941