Log base 2 of large integers

[Peter Pearson]

On Wed, 13 Aug 2014 15:58:02 +0200, Peter Otten <__peter__ at web.de> wrote:
> Mok-Kong Shen wrote:
>  
>> I like to compute log base 2 of a fairly large integer n but
>> with math.log(n,2) I got:
>> 
>> OverflowError: long int too large to convert to float.
[snip]
> Or maybe our idea of "fairly large" differ; so how large is fairly large?

MK Shen used to hang out on the sci.crypt newsgroup, so we're
probably talking "cryptographically large" rather than "engineeringly
large".

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