244530

Appears in sequences

• The third left hand column of triangle A167552.at n=17A167555
• Numbers k such that phi(k+1) = 4*phi(k).at n=7A172314
• Product of Catalan and Jacobsthal numbers: a(n) = A000108(n)*A001045(n+1).at n=8A200375
• Let s(k) denote the sum of the even proper divisors of k. The sequence lists the pairs of numbers (x, y) such that s(x) = y and s(y) = x.at n=27A279812
• List of ordered pairs (x, y) from A279812.at n=28A279950
• Triangular array read by row: T(m,n) = number of ways to obtain a single sphere by gluing the (labeled) sides of a (2m+1)-gon and a (2n+1)-gon, m >= n >= 0.at n=30A297897