21566892818
domain: N
Appears in sequences
- Denominators of continued fraction convergents to sqrt(20).at n=17A041031
- Denominators of continued fraction convergents to sqrt(180).at n=17A041333
- Denominators of continued fraction convergents to sqrt(500).at n=25A041955
- Number of (1,0)-steps of weight 1 at level 0 in all weighted lattice paths in L_n.at n=26A182890
- Numbers x such that 20*x^2 + 1 is a perfect square.at n=9A207832