[racket] spirit of Racket?

Which leads to question: when to use nested define and when to use let?

> From: matthias at ccs.neu.edu
> Date: Sun, 11 Mar 2012 19:14:38 -0400
> To: jgilray at gmail.com
> CC: users at racket-lang.org; justin at zamora.com
> Subject: Re: [racket] spirit of Racket?
> 
> 
> I believe the code below cuts your running time to one third. -- Matthias
> 
> #lang racket
> 
> (require srfi/13)
> 
> (define (euler4e)
>   (for*/fold ([greatest 0]) ([first (in-range 101 1000)] [second (in-range first 1000)])
>     (define prod (* first second))
>     (if (palindromic? prod) (max greatest prod) greatest)))
> 
> (define (palindromic? n)
>   (define s (number->string n))
>   (define r (string-reverse s))
>   (string=? s r))
> 
> 
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