a+b = (810^n + 2) + (410^n + 1) = 12*10^n + 3
a-b = (810^n + 2) - (410^n + 1) = 4*10^n + 1
ab = (810^n + 2) (410^n + 1) = 3210^(2n) + 810^n + 810^n + 2 = 3210^(2n) + 16*10^n + 2
a:b = (810^n + 2) / (410^n + 1) = (2 + 610^n) / (1 + 310^n)
a+b = (810^n + 2) + (410^n + 1) = 12*10^n + 3
a-b = (810^n + 2) - (410^n + 1) = 4*10^n + 1
ab = (810^n + 2) (410^n + 1) = 3210^(2n) + 810^n + 810^n + 2 = 3210^(2n) + 16*10^n + 2
a:b = (810^n + 2) / (410^n + 1) = (2 + 610^n) / (1 + 310^n)