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a_n=f(\cdots,a_{n-2},a_{n-1},n,a_{n+1},a_{n+2},\cdots)
e^{i/pi} = -1
f(x)=/int_0^{x}g(t)/,dt
/zeta(x) = /prod_{p : prime} /frac{p^x}{p^x - 1}
/prod_{p : prime} /frac{p^2}{p^2-1} = /frac{/pi^2}{6}