How many numbers, from 1 to 50 (both included) can you arrange in a row (one of each) so that each one, except the first and the last, is the sum or difference of its two neighbours?

Example: 3, 10, 7, 17, 24, 41.

10 = 3+7, 7 = 17-10, 17 = 24-7, 24 = 41-17.

(In reply to re(2): computer solution ---- can you check, please? by Charlie)

Ok, ty.

Posted by pcbouhid on 2008-11-21 08:04:59