floor() function and mathematical integers

[Aahz Maruch]

In article <3b0d45dd.203569207 at wa.news.verio.net>,
Bengt Richter <bokr at accessone.com> wrote:
>
> >>> import math
> >>> M=5L; B=3L; E=33L
> >>> a = M*B**E
> >>> a,float(a),math.floor(a)
> (27795302832777615L, 27795302832777616.0, 27795302832777616.0)
> >>> prb(a)
> 1100010101111111010111000111111110001011010100110001111

What's this prb() function?
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