146866

Appears in sequences

• Integers k such that phi(prime(k)+1) = phi(prime(k)-1).at n=16A066902
• Number of n-step closed paths on the Cairo pentagonal lattice graph starting from a degree-3 node.at n=13A357811
• Number of permutations of [n] that avoid the patterns 2-41-3, 3-14-2, and 2-1-3-5-4.at n=10A363809