OT-Governor General binary

[D. Hugh Redelmeier]

| From: D. Hugh Redelmeier <hugh-pmF8o41NoarQT0dZR+AlfA at public.gmane.org>

| I wrote two variants of a program to count 33-bit binary palindromic
| primes.  They both count 5572.  They both might be buggy.

I should have mentioned that this code only works on C implementations
where unsigned long can hold 33-bit numbers (eg. AMD64, but not i386).
I could have used unsigned long long as the type but then
mpz_init_set_ui would have been unhappy.

There is a simple work-around.  Since 32-bit numbers are representable
in unsigned long, and the 33rd bit is always one in a call to
mpz_init_set_ui, it is pretty simple to code around the limitation of
32 bit unsigned long.

So I saved a little bit of code at the expense of portability.  Bad
me.
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