105641

Appears in sequences

• Numbers n such that n'' = n'+1 where n' and n'' are respectively the first and the second arithmetic derivative of n (A003415).at n=23A189639
• Number of lone-child-avoiding locally disjoint unlabeled rooted trees with n vertices.at n=25A331680
• Numbers k for which sigma(k) = k + k'', where k'' is the second derivative of k (A068346).at n=24A348426