161001

Appears in sequences

• Numbers k such that k and k+1 have same sum of divisors.at n=30A002961
• Numbers k such that k and k+1 have the same sum but an unequal number of divisors.at n=20A054007
• 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=16A063071
• 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=40A223136
• Numbers n such that floor(antisigma(n) / sigma(n)) = floor(antisigma(n+1) / sigma(n+1)).at n=22A244666
• Number of 2-Abelian equivalence classes of words of length n over an alphabet of size 3.at n=20A289658
• Numbers k such that iphi(k) = iphi(k+1), where iphi is the infinitary totient function (A064380).at n=16A301866