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use anyhow::{Context, Result};
use num::BigUint;
...
    println!("{}", frob(1000)?);
    Ok(())
}

i8 127
i16 32767
...
7417851608292301353580818400969963725242305608559037006242712434169090
+041536901059339838357779394109700277534720000000000000000000000000000
+000000000000000000000000000000000000000000000000000000000000000000000
+00000000000000000000000000000000000000000000000000000000000000000000\
0000000000000000000000000000000000000000000000000000000000000000000000
+00000000000000