54891

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(5)*k is 2.at n=42A065030
• Schroeder pseudoprimes: Composites k that divide the k-th Schroeder number A001003(k-1).at n=33A075764
• a(n) = 8*n^3 + n.at n=19A118465