282555

Appears in sequences

• f-perfect numbers, where f(m) = sigma(m)-m.at n=5A066365
• a(n) is the least number k such that A349497(k) = n, or -1 if no such k exists.at n=27A349498
• Triangle read by rows: T(n, k) is the number of chains of length k in the poset of permutations of an n-set.at n=34A375835