1358127

Appears in sequences

• Primitive numbers k that divide sigma(k)*phi(k).at n=29A055196
• a(n) = n^3*(5*n+3)/2.at n=27A229146
• Number of ascending runs in {1,...,3}^n.at n=11A229277
• The number of nonequivalent root ancestral configurations in a recursively defined family of gene trees and species trees with at least n = 9 leaves, in which for n >= 12 leaves, 3-leaf trees are successively added at the root of the tree with n-3 leaves.at n=30A355118