69993

Appears in sequences

• Denominators of continued fraction convergents to sqrt(51).at n=5A041087
• Denominators of continued fraction convergents to sqrt(204).at n=11A041379
• Denominators of continued fraction convergents to sqrt(816).at n=11A042575
• a(n) = 7*(10^n - 1).at n=4A086578
• y-values in the solution to x^2-51*y^2=1.at n=3A174855
• Indices k such that s_k(4) is a (probable) prime, where s_k(4) = 4*s_{k-1}(4) - s_{k-2}(4), k >= 2, s_0(4) = 1, s_1(4) = 5.at n=23A299100