267630

Appears in sequences

• Numbers k such that the average of the divisors of k and k+1 is the same.at n=31A238380
• Numbers m such that tau(m) = 2 * tau(m + 1) and simultaneously sigma(m) = 2 * sigma(m + 1), where tau(k) = A000005(k) and sigma(k) = A000203(k).at n=5A353034