1499219281
domain: N
Appears in sequences
- Numerators of continued fraction convergents to sqrt(10).at n=12A005667
- Numerators of continued fraction convergents to sqrt(40).at n=11A041066
- Numerators of continued fraction convergents to sqrt(90).at n=11A041160
- Numerators of continued fraction convergents to sqrt(160).at n=23A041294
- Numerators of continued fraction convergents to sqrt(360).at n=11A041682
- Numerators of continued fraction convergents to sqrt(810).at n=15A042562
- Chebyshev T(n,19) polynomial.at n=6A078986
- Array of ((k^n)+(k^(-n)))/2 where k=(sqrt(x^2+1)+x)^2 for integers x>=1.at n=38A188645
- a(n) = 6*a(n-2) + a(n-4), where a(0) = 3, a(1) = 5, a(2) = 19, a(3) = 31.at n=22A228471
- a(n) = 32*n^6 - 48*n^4 + 18*n^2 - 1.at n=19A243132
- Numerators of continued fraction convergents to sqrt(10)/2 = sqrt(5/2) = A020797 + 1.at n=35A295333
- Positive numbers m such that m^2 with last digit z deleted is still a perfect square k^2, and z divides m-k.at n=12A343034