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    Excel and primenumbers

    Hey, sorry if this has been asked before, but I couldn't seem to find a post for it. I'm trying to use this array formula which I founded on this site, that tells if a number is a prime or not =IF(MIN(MOD($B$5,ROW(INDIRECT("2:"&INT(SQRT($B$5))))))=0,"not prime","prime"). I just can't get it to...
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