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Extract the n-th digit of a duocentehexaquinquagesimal number
.digit256(x, d)
For b = 256
b = 256
if $$x = a_0 + a_1b + a_2b^2 + a_3b^3$$
then .digit(x, d) = a_d
.digit(x, d) = a_d
integer(n)
integer(1) One of 0:3. Other integers silently return x.
integer(1)
x