66978574

Appears in sequences

• Denominators of continued fraction convergents to sqrt(20).at n=13A041031
• Denominators of continued fraction convergents to sqrt(180).at n=13A041333
• Denominators of continued fraction convergents to sqrt(500).at n=19A041955
• a(n) = a(n-1) + a(n-2) + 1 if n is a multiple of 6, otherwise a(n) = a(n-1) + a(n-2).at n=38A131132
• Number of (1,0)-steps of weight 1 at level 0 in all weighted lattice paths in L_n.at n=20A182890
• Numbers x such that 20*x^2 + 1 is a perfect square.at n=7A207832
• a(1) = a(2) = 1; for n > 2, a(n) is the product of prime factors of the n-th Fibonacci number.at n=41A238684
• a(n) is the least integer k such that k/Fibonacci(n) > 1/4.at n=42A293552
• a(n) is the integer k that minimizes |k/Fibonacci(n) - 1/4|.at n=42A293553