64672
domain: N
Appears in sequences
- Numbers k such that sigma(k+1)+sigma(k) = sigma(2k+1).at n=6A067171
- Numbers k such that (sigma(k)+sigma(k+1))/sigma(2*k+1) is an integer, where sigma = A000203.at n=13A091287
- Duplicate of A067171.at n=6A091288
- Numbers k such that s(k) = s(k+1), where s(k) is the sum of recursive divisors of k (A333926).at n=17A333949
- Numbers k such that A051378(k) = A051378(k+1).at n=18A349283