Little explorations with HP calculators (no Prime)

09102017, 09:55 AM
Post: #227




RE: Little explorations with the HP calculators
Ok while the other problem is still open (1), a new one.
given 4 different positive integers: a, b, c, d . Find all the quadruplets where all the terms are smaller than 1000, that satisfy the following identify (a+b) / (c+d) = (ab) / (cd) (I did not attack it yet). Bonus: do the same for positive integers: a, b, c, d where there are at least 3 different integers. Once again, I do not see how those can be list/string challenges, if someone has an idea, he is welcomed! (note1) or better, I think that getting the information whether Alan is ahead of Bob for the entry N should be not that complicated unless I am mistaken. Wikis are great, Contribute :) 

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