117860

Appears in sequences

• Numbers k such that sigma(k) and sigma(k+1) are nontrivial powers (A065496).at n=22A065522
• Number of partial order relations on [n] such that 1 and 2 are in the same connected component.at n=4A352761
• Triangle read by rows: T(n, k) is the number of invertible n X n matrices over GF(2) that can be optimally row-reduced in k steps, n >= 0, k >= 0.at n=28A381854