10 {. I. (= |.&.":"0) (* 9+]) i.12000
0 2 12 44 137 157 167 248 258 1639
----- Original Message -----
From: Roger Hui <[email protected]>
Date: Monday, August 24, 2009 23:26
Subject: Re: [Jprogramming] Finding n where n(n+9) is an palindrome
To: Programming forum <[email protected]>
> 10 {. n #~ (= |.&.":"0) (* 9+]) n=: >:i.12000
> 2 12 44 137 157 167 248 258 1639 1664
>
>
>
> ----- Original Message -----
> From: Ian Gorse <[email protected]>
> Date: Monday, August 24, 2009 23:04
> Subject: [Jprogramming] Finding n where n(n+9) is an palindrome
> To: [email protected]
>
> > I have been browsing through
> > http://www2.stetson.edu/~efriedma/numbers.html the past couple
> > of days, I
> > have been using it to try my own personal problem solving to educate
> > myself with J
> >
> > For example:
> > 258 is a value of n so that n(n+9) is a palindrome.
> >
> > I set out to find the first 10 numbers that meet this criteria
> > and I
> > came up with this..
> >
> > 10 {. n #~ ,( ( ] = [: ". [: |. ": ) ] * +&9 ) "0 ( n =.
> >:
> > i.12000 )
> > 2 12 44 137 157 167 248 258 1639 1664
> >
> > As you can see, I have already found my answers but this is
> just an
> > educational request.
> > I am just looking for some alternative solutions so I can read and
> > digest the different ways it can be done. Ideally with the use
> > of the
> > @ conjuction as
> > I have recently been understanding the conjuction @ a lot
> more,
> > as I
> > find the 'flow' of reading the J expression more fluent.
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