The book is now available! 715466058
(another Prime Pages' Curiosity)
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+ It is hard to find larger non-semiprime intervals. More harder is to find an interval with no prime and no nonsemi-primes! The start of a record-breaking run of 53 consecutive integers (715466058-715466110). There are no primes and non-semiprimes. There are no greater runs less than 10^9. [Luhn]

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