130050

Appears in sequences

• Unbalanced strings of length n.at n=17A027556
• Numbers k such that phi(2*sigma(k)) = 2*sigma(phi(k)).at n=30A067709
• Number of pairs of polynomials (f,g) in GF(2)[x] satisfying 1 <= deg(f) <= n, 1 <= deg(g) <= n and gcd(f,g) = 1.at n=8A087291
• Half the number of n X n toroidal binary arrays with each element having the sum of its vertical neighbors equal to the sum of its horizontal neighbors.at n=15A184096
• Numbers k such that phi(sigma(k))/sigma(phi(k)) = 2.at n=14A229238
• Numbers A055744(n) such that for any k < n, A055744(k) and A055744(n) do not have all their prime factors in common.at n=30A256431
• Number of nX2 0..1 arrays with every repeated value in every row and column unequal to the previous repeated value, and new values introduced in row-major sequential order.at n=14A267638
• Number of ways to write n as an ordered sum of ten powers of 2.at n=32A342254