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TOT 091 1985 Spring Train S2 largest subset with diff, of any 2 not prime

Source:

August 24, 2019
DifferenceprimeCompositenumber theorycombinatoricsmaximum

Problem Statement

From the set of numbers 1,2,3,...,19851 , 2, 3, . . . , 1985 choose the largest subset such that the difference between any two numbers in the subset is not a prime number (the prime numbers are 2,3,5,7,...,12, 3 , 5 , 7,... , 1 is not a prime number) .
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