211303

Appears in sequences

• Denominators of continued fraction convergents to sqrt(15).at n=12A041023
• a(n) = 8*a(n-1) - a(n-2), a(0)=1, a(-1)=1.at n=6A070997
• a(n)*a(n+3) - a(n+1)*a(n+2) = 3, given a(0)=a(1)=1, a(2)=4.at n=13A080871
• Main diagonal of array A094954.at n=6A094955
• Numerators in continued fraction expansion of sqrt(3/5).at n=12A145542
• Generalized Markoff numbers: largest number a in a 5-tuple a >= b >= c >= d >= e satisfying the Markoff(5) equation a^2 + b^2 + c^2 + d^2 + e^2 = 4*a*b*c*d*e.at n=24A229241