873121

Properties

Appears in sequences

• Real part of (1 + 2*i)^n, where i is sqrt(-1).at n=17A006495
• 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=35A098122
• Expansion of 1/(1 - 4*x + 5*x^2).at n=16A099456
• Column 0 of triangle A118435.at n=17A118436
• Values of y such that x^2 + y^2 = 5^n with x and y coprime and 0 < x < y.at n=16A230711
• Prime numbersat n=69318