111507

Appears in sequences

• Numbers k that divide sigma(k) - sigma(k-1).at n=33A227307
• Numbers k such that sigma(k) = sigma(k-1).at n=25A231546
• Numbers k such that tau(k) = 2*tau(k-1) and sigma(k) = sigma(k-1), where tau(k) and sigma(k) are respectively the number and sum functions of the divisors of k.at n=3A347603