Little explorations with HP calculators (no Prime)
|
09-11-2017, 09:21 PM
(This post was last modified: 09-11-2017 10:25 PM by Gilles59.)
Post: #229
|
|||
|
|||
RE: Little explorations with the HP calculators
(09-10-2017 10:46 AM)AlexFekken Wrote: Don't want to spoil too much of the fun but this is equivalent to a / b = c / d <> 1. That's a lot ! HP50G '(a+b) / (c+d) = (a-b) / (c-d)' 'a' ISOL -> a=(c.b)/d That means (if we dont care about 2 same values of a b c d), that the number of quadruplets is the sum of the divisors of c*b for c:1->999, b:1->999 Quick and dirty HP50G + GoferList: Code: « Get ready for ~ 1000000 Shift CONT ex : { { 'a=2' 'd=7' 'b=14' 'c=1' } { 'a=7' 'd=2' 'b=14' 'c=1' } } |
|||
« Next Oldest | Next Newest »
|
User(s) browsing this thread: 3 Guest(s)