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EXAMPLE
| a(6)=6787314293760 because {2,3,5,7,11,13}={prime(1),prime(2),..., prime(6)} is the set of prime factors of 6787314293760,
all six numbers 2*6787314293760-1,3*6787314293760-1, 5*6787314293760-1,7*6787314293760-1,11*6787314293760-1 & 13*6787314293760-1 are prime and 6787314293760 is the first number with such properties.
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