Re: The "Strand" puzzle --- ( Continued Fractions using Lisp orPython? )

For your reference, records indicate that
"B. Pym" <Nobody447095@here-nor-there.org> wrote:

  ===>
352

 
Faster:

But is it correct?  Because surrounding 352 I get (with Ruby):

irb(main):001:0> (50..351).sum
=> 60551
irb(main):002:0> (353..500).sum
=> 63122

This solution for the example:

irb> x = 1
=> 1
irb> y = 8
=> 8
irb> (x..y).select {|n| (x..(n-1)).sum == ((n+1)..y).sum}
=> [6]

For the puzzle yields:

irb> x = 50
=> 50
irb> y = 500
=> 500
irb> (x..y).select {|n| (x..n-1).sum == (n+1..y).sum}
=> []

So no house.  I’ll skip the full output, but for the tipping point I see:

irb> (x..y).select {|n| puts "#{n} #{(x..(n-1)).sum} #{((n+1)..y).sum}"}

355 61610 62060
356 61965 61704

--
"Also . . . I can kill you with my brain."
River Tam, Trash, Firefly