66808

Appears in sequences

• Numbers k such that k and k^2 use only the digits 0, 3, 4, 6 and 8.at n=16A136931
• a(n) = prime(prime(prime(A028815(n) - 1) - 1) - 1) - 1.at n=35A141133
• Triangle T(n,k) = number of forests of labeled rooted trees of height at most 1, with n labels, k of which are used for root nodes and any root may contain >= 1 labels, n >= 0, 0<=k<=n.at n=42A143396
• Coordination sequence for (2,5,infinity) tiling of hyperbolic plane.at n=24A265068
• Number of forests of labeled rooted trees of height at most 1, with n labels, six of which are used for root nodes and any root may contain >= 1 labels.at n=2A273656
• Expansion of 1/( (1-x) * (1-x-9*x^3)^2 )^(1/3).at n=14A383606