37612domain: NAppears in sequencesNumbers k such that the sum of the first k composite numbers is palindromic.at n=13A053779Numbers that are the least element of a k-cycle (k > 1) of permutation A113821.at n=27A115641a(n) = 49n^2 - 28n - 20.at n=27A118058Number of (undirected) paths in the n-book graph.at n=20A307921