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Benedict Irwin edited Introduction.tex
over 9 years ago
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Require a counter proof of the statement, "any non-prime whose ordered concatenation is prime has either $4$ or $6$ divisors".
Counterproof: 531832651281459 has 128 divisors. But it's prime factors are 3*3*3*11*139*653*3863*5107, which have an ordered concatenation of 3331113965338635107 which is prime.