554527

Properties

Appears in sequences

• Number of functions f:{1,2,...,n}->{1,2,...,n} whose cycle lengths are <= 2.at n=7A209319
• Number A(n,k) of endofunctions on [n] whose cycle lengths are divisors of k; square array A(n,k), n>=0, k>=0, read by antidiagonals.at n=52A246522
• Odd integers k such that 5^((k-1)/2) + 1 == 0 (mod k*(k-1)/2).at n=28A337829
• Prime numbersat n=45663