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COMMENTS
| The terms beyond a(3), found by PrimeForm, produce probable primes of lengths 24, 199, 1747 and 16474 digits. As both (8!)! and 2*((8!)!) each have the same number of digits, a(8) will correspond to a 168187-digit prime (by Bertrand's Postulate). For all n, if k > 1, then k >= nextprime(n!). As (8!)!+1 is composite, a(8) >= 40343.
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