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by mahmud 6082 days ago
A "language" that has fibonacci builtin can do it 2 characters. fx. where f is the name of the fibonacci function and x is a single digit number.

A fibonacci DSL could do it in 1; if all input is expected to be an integral value and the machine only computes fibonacci values, then typing a single digit number would have the intended consequence:

   (loop
     (print (fib (parse-integer (read)))))