47045

Appears in sequences

• Composite numbers k+1 such that k*phi(k+1) is a perfect square.at n=31A069068
• The continued fraction of the constant r > sqrt(3) such that the partial quotients equal the integer floor of the powers of r.at n=19A227233
• Odd numbers k, not powers of primes, such that sigma(k) == 2 modulo 8 and sigma(sigma(k)) == 6 modulo 8.at n=10A332458
• If F is the Fermat point of a triangle ABC with A < B < C < 2*Pi/3, where AB, BC, CA, FA, FB and FC are all positive integers, then, this sequence gives the sum FA + FB + FC when gcd(a, b, c) = A351477(n).at n=9A351476
• Numbers k such that sigma(k) = psi(k) + tau(k).at n=45A387953