509830

Appears in sequences

• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 42.at n=33A031720
• Triangle T(n, k) = A143491(n+2, k+2) + A143491(n+2, n-k+2), read by rows.at n=38A155755
• Triangle T(n, k) = A143491(n+2, k+2) + A143491(n+2, n-k+2), read by rows.at n=42A155755
• a(n) = 1156*n^2 + 34.at n=21A158731