217217

Appears in sequences

• Numbers n such that n, n+1, and the sum of those two numbers each have 4 or more distinct prime factors.at n=28A168630
• n*(n+1)*(n+2)*(n+3)*(20*n^2+72*n+43)/360.at n=11A214616
• Number T(n,k) of endofunctions on [n] with exactly k fixed points, none of which are isolated; triangle T(n,k), n >= 0, 0 <= k <= n/2, read by rows.at n=17A350454