40505

Appears in sequences

• Denominators of continued fraction convergents to sqrt(457).at n=12A041871
• Numbers k such that k^3 divides 4^(k^2) + 1.at n=5A128678
• a(1) = 0 and a(n+1) > a(n) is the smallest integer such that a(n+1)^2-a(n)^2 is triangular.at n=21A358416
• G.f. satisfies A(x) = 1 + x^2*A(x)^4 / (1 - x*A(x)).at n=12A365690