116937
domain: N
Appears in sequences
- Numbers k such that k and k+1 have same sum of divisors.at n=26A002961
- Numbers k such that k and k+1 have the same sum but an unequal number of divisors.at n=17A054007
- Numbers k such that sigma(k)*omega(k) = sigma(k+1)*omega(k+1), where omega(k) is the number of distinct prime divisors of n (A001221).at n=14A063071
- Number of labeled trees with n nodes and even number of leaves minus number of labeled trees with n nodes and odd number of leaves.at n=7A090347
- Numbers n such that sigma(n+1) - sigma(n) = k*n for some integer k, where sigma(n) = A000203 (sum of divisors of n).at n=35A223136
- Numbers k such that iphi(k) = iphi(k+1), where iphi is the infinitary totient function (A064380).at n=15A301866
- Numbers m such that the delta(m) = abs(sigma(m+1)/(m+1) - sigma(m)/(m)) is smaller than delta(k) for all k < m.at n=31A335071