29795040

Appears in sequences

• Numbers n with the property that, if tau(n) = k = number of divisors of n, and the d(i) are the divisors [arranged in increasing order], then the sum 1/d(k) + 1/d(k-1) + 1/d(k-2) + ... + 1/d(q) is an integer for some q.at n=26A226476
• Integers m such that the sum of the first k divisors is equal to 2*m for some k less than the number of divisors of m.at n=7A306373
• Composite k for which lcm(k, phi(k)) + lcm(k, tau(k)) = lcm(k, sigma(k)).at n=30A328651