So I found this using 2 to the power of >= 31

[Jonathan M Davis]

On Thursday, June 13, 2013 03:46:59 Carlos wrote:
> import std.stdio;
> import std.math : pow;
> 
> void main()
> {
> cast(ulong)count;

That line won't compile.

> foreach (count; 1 .. 33){
> write((2)^^(count), " : ", count, "\n");
> }
> }
> 
> same output.

If you want to set the type of count, then give it a type instead of letting 
foreach infer it. Integeral literals are inferred to be int, so if you don't 
give count a type, it'll be int.

import std.stdio;
import std.math : pow;

void main()
{
    foreach(ulong count; 1 .. 33)
        writefln("%s: %s", 2^^count, count);
}

- Jonathan M Davis