7027801

Appears in sequences

• Numbers n dividing u(n), where the Lucas sequence is defined u(i) = u(i-1) - 3*u(i-2) with initial conditions u(0)=0, u(1)=1.at n=33A228440
• A sequence used in the touching circle problem described in A247512.at n=6A246643
• Squares that are also pentagonal pyramidal numbers.at n=11A277792
• Detour index of the n X n black bishop graph.at n=21A387645
• a(n) = (8*n + 1)^2*(4*n + 1).at n=30A387684