| a(1) = 2 * 3 = 6 (the product of the first 2 primes)
a(2) = 5 * 7 * 11 = 385 (the product of the next 3 primes)
a(3) = 13 * 17 * 19 * 23 * 29 = 2800733 (product of next 5 primes)
a(4) = 31 * 37 * 41 * 43 * 47 * 53 * 59 = 297194980009 (product next 7 primes)
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