Authors: Marius Coman
In a previous paper I presented a type of numbers which seem to be often m-primes or m-composites (the numbers of the form 1nn...nn1, where n is a digit or a group of digits, repetead by an odd number of times). In this paper I present a type of numbers which seem to be often c-primes or c-composites. These are the numbers of the form 1abc (formed through concatenation, not the product 1*a*b*c), where a, b, c are three primes such that b = a + 6 and c = b + 6.
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[v1] 2015-04-08 09:31:39
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