Little explorations with HP calculators (no Prime)

09112017, 09:21 PM
(This post was last modified: 09112017 10:25 PM by Gilles59.)
Post: #229




RE: Little explorations with the HP calculators
(09102017 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) = (ab) / (cd)' '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' } } 

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