61050

Appears in sequences

• Numbers n such that sigma(reverse(n)) = phi(n).at n=21A070856
• Triangle read by rows: T(n,k) is the number of permutations of the cyclic group Z/nZ whose longest embedded arithmetic progression has length k.at n=57A339942
• G.f. satisfies A(x) = 1 + x^4*A(x)*(1 + x*A(x)).at n=42A365727