404471

Appears in sequences

• Quasi-Carmichael numbers to exactly six bases.at n=1A257756
• Numbers k such that (k, k+2) are not twin primes yet sigma(k+2)/d(k+2) - sigma(k)/d(k) = 1.at n=6A322668
• Numbers k such that k and k+2 have the same deficiency (A033879).at n=6A330901
• Odd numbers k such that phi(k) = phi(k+2), where phi is the Euler totient function (A000010).at n=21A333741
• Numbers k such that k and k+2 have the same unitary abundance (A129468).at n=24A335252
• Maximum power V_s*A_s consumed by an electrical network with n unit resistors and input voltage V_s and current A_s constrained to be exact integers which are coprime, and such that all currents between nodes are integers.at n=12A340726