Do the digits have to be in the correct order?
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Only for "nice" or "orderly" Friedman numbers. For example: 127 = −1 + 2^7 is a nice Friedman number.
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5120 = 5*2^10
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1024 = (4 − 2)^10
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All Roman numerals with more than one symbol are Friedman numbers (just insert + signs into the numeral). The number 8 is an example of a non-trivial Friedman number VIII = (V - I) × II
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Not true for IV, but -I+V=IV
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#Math How to tell a number is a Friedman's one? Is there an appropriate algorithm for the purpose? -
Nah, unless there exist a non trivial trick this problem is rather hard (essentially bruteforce)
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Thread on Friedman numbers.https://twitter.com/panlepan/status/922737702012891137?s=19 …
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Not a Friedman Number but I once found out about this by accident: 365*2-1 == (36-5*2+1) * (36-5*2+1)
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