39480499

Appears in sequences

• Numerators of continued fraction convergents to sqrt(10).at n=10A005667
• Numbers whose square with its last digit deleted is also a square.at n=36A031149
• Numerators of continued fraction convergents to sqrt(40).at n=9A041066
• Numerators of continued fraction convergents to sqrt(90).at n=9A041160
• Numerators of continued fraction convergents to sqrt(250).at n=13A041468
• Numerators of continued fraction convergents to sqrt(360).at n=9A041682
• Numerators of continued fraction convergents to sqrt(1000).at n=17A042936
• Numbers k such that k^2-1 and k^2 are consecutive powerful numbers.at n=19A060860
• Chebyshev T(n,19) polynomial.at n=5A078986
• Duplicate of A005667.at n=10A084133
• Array of ((k^n)+(k^(-n)))/2 where k=(sqrt(x^2+1)+x)^2 for integers x>=1.at n=30A188645
• a(n) = 6*a(n-2) + a(n-4), where a(0) = 3, a(1) = 5, a(2) = 19, a(3) = 31.at n=18A228471
• a(n) = 16*n^5 - 20*n^3 + 5*n.at n=19A243131
• Numerators of continued fraction convergents to sqrt(10)/2 = sqrt(5/2) = A020797 + 1.at n=29A295333
• 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=10A343034