221651

Appears in sequences

• Denominators of continued fraction convergents to sqrt(35).at n=10A041059
• Generalized Markoff numbers: union of numbers a, b, c, d satisfying the Markoff(4) equation a^2 + b^2 + c^2 + d^2 = 4*a*b*c*d.at n=18A075276
• Chebyshev T-sequence with Diophantine property.at n=5A077417
• a(n)*a(n+3) - a(n+1)*a(n+2) = 5, given a(0)=a(1)=1, a(2)=6.at n=11A080875
• G.f. A(x) satisfies A(x) = (1 + x*A(x)^3)/(1 - x*A(x))^2.at n=6A379174