3345408

Appears in sequences

• Numbers k such that phi(sigma(k)) = k.at n=13A001229
• Totient of 2^n+1.at n=22A053285
• Numbers k such that k = phi(sigma(phi(sigma(k)))).at n=29A067883
• Numbers k such that k = phi(sigma(phi(sigma(phi(sigma(k)))))).at n=28A067884
• Expansion of 8 * (eta(q^2) / eta(q)^2)^8 in powers of q.at n=7A105094
• Numbers n such that n = k/d(k) has exactly 6 solutions, where d(k) = number of divisors of k.at n=18A217127
• a(n) = phi(4^n+1), where phi is Euler's totient function (A000010).at n=11A366608
• Numbers which are the minimum of a cycle in the map x -> phi(sigma(x)).at n=31A376256