If the radix is 15 or higher, we can't use the letter `e' to mark
the exponent because `e' is interpreted as a digit. When Calc
needs to display scientific notation in a high radix, it writes
`16#F.E8F*16.^15'. You can enter a number like this as an
algebraic entry. Also, pressing e without any digits before it
normally types 1e, but in a high radix it types 16.^ and
puts you in algebraic entry: 16#f.e8f RET e 15 RET * is another
way to enter this number.
The reason Calc puts a decimal point in the `16.^' is to prevent
huge integers from being generated if the exponent is large (consider
`16#1.23*16^1000', where we compute `16^1000' as a giant
exact integer and then throw away most of the digits when we multiply
it by the floating-point `16#1.23'). While this wouldn't normally
matter for display purposes, it could give you a nasty surprise if you
copied that number into a file and later moved it back into Calc.
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