Mark Dickinson <dicki...@gmail.com> added the comment:
It's Table 3.6 ("Decimal interchange format parameters") in the final version
of IEEE 754; I'm not sure what that corresponds to in the various drafts. It
has column headings: "decimal32", "decimal64", "decimal128" and "decimal{k} (k
>= 32)".
Parameters for decimal{k}: k must be a multiple of 32. precision is
9*k/32-2. emax is 3*2**(k/16+3). I think these formulas all work for the
specific cases k in {32, 64, 128} too, so it should be easy to check that they
make sense.
They give an example below the table, too:
"For example, decimal256 would have p = 70 and emax = 1572864."
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<http://bugs.python.org/issue8786>
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