56564
domain: N
Appears in sequences
- Numbers k such that k and k+1 have same sum of divisors.at n=17A002961
- Numbers k such that k and k+1 have the same sum but an unequal number of divisors.at n=11A054007
- Numbers k such that sigma(k) divides sigma(k+1), where sigma(k) is sum of positive divisors of k.at n=35A058072
- 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=12A063071
- Non-palindromic numbers such that the two largest proper divisors are palindromes having at least two digits and no other divisor is a palindrome with at least two digits.at n=38A074889
- 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=25A223136
- Table of consecutive numbers with the same sum of divisors.at n=34A225757
- 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=23A335071