2521451

Properties

Appears in sequences

• Let (A,B)=(a(2*n),a(2*n+1)), then (A,B) is (even,odd), gcd(A,B)=1 and A^2 + B^2 = 5^n. Note: a(0)=0.at n=39A098122
• Expansion of 1/(1 - 4*x + 5*x^2).at n=18A099456
• Column 0 of triangle A118438.at n=19A118439
• Values of x such that x^2 + y^2 = 5^n with x and y coprime and 0 < x < y.at n=18A230710
• Prime numbersat n=184516