No, the expression has to be 1+<.1505%a .

Let k be an element of a.  If k exactly divides 1505
with a quotient of q, the needed numbers are
0 1 2 ... q , in other words i.1+q, in other words
i.1+<.1505%k .   If k does not exactly divide 1505, 
the needed numbers are again 0 1 2 ... 1+<.1505%k .



----- Original Message -----
From: Randy MacDonald <[EMAIL PROTECTED]>
Date: Sunday, January 6, 2008 20:04
Subject: Re: [Jprogramming] Not so hard to solve the comic in J?
To: Programming forum <[email protected]>

> Sorry,
> 
>  >. 1505 % a
> 
> Too easy to make a spelling mistake, especially a 1-pixel one.
> 
> Roger Hui wrote:
> > But
> >    >: 1505 % a
> > 8 6.47273 5.49254 5.23944 4.58333 3.59483
> >
> > and non-integers would lead to errors in later expressions.
> >
> >
> >
> > ----- Original Message -----
> > From: Randy MacDonald <[EMAIL PROTECTED]>
> > Date: Friday, January 4, 2008 12:10
> > Subject: Re: [Jprogramming] Not so hard to solve the comic in J?
> > To: Programming forum <[email protected]>
> >
> >   
> >> Hello Roger;
> >>
> >> n =: >: 1505 % a
> >>
> >> If this has been noted, my apologies: I'm doing Xmas catchup.
> >>
> >> Roger Hui wrote:
> >>     
> >>> The calculation of n was off by 1, and the correction is as 
> follows:>>>
> >>>    a=: 215 275 335 355 420 580
> >>>    n=: 1 + <.1505 % a
> >>>    b=: 1505 = ((#: i.@(*/)) n) +/ .* a
> >>>    n #: I. b
> >>> 1 0 0 2 0 1
> >>> 7 0 0 0 0 0
> >>>    (n #: I. b) +/ .* a
> >>> 1505 1505
> >>>
> >>>
> >>>
> >>> ----- Original Message -----
> >>> From: Roger Hui <[EMAIL PROTECTED]>
> >>> Date: Friday, December 21, 2007 13:43
> >>> Subject: Re: [Jprogramming] Not so hard to solve the comic 
> in J?
> >>> To: Programming forum <[email protected]>
> >>>
> >>>   
> >>>       
> >>>>    a=: 215 275 335 355 420 580
> >>>>    n=: <.1505 % a
> >>>>    b=: 1505 = ((#: i.@(*/)) n) +/ .* a
> >>>>    n #: I. b
> >>>> 1 0 0 2 0 1
> >>>>    1 0 0 2 0 1 +/ .* a
> >>>> 1505
> >>>>
> >>>>
> >>>>
> >>>> ----- Original Message -----
> >>>> From: Devon McCormick <[EMAIL PROTECTED]>
> >>>> Date: Friday, December 21, 2007 13:32
> >>>> Subject: [Jprogramming] Not so hard to solve the comic in J?
> >>>> To: J-programming forum <[email protected]>
> >>>>
> >>>>     
> >>>>         
> >>>>> How hard is it to solve this problem?  http://xkcd.com/287/
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