The next term is too large to include.
The terms a(1), a(2), and a(3) are primes.
The next term a(4) is a composite number, a pseudoprime to base 3.
If a(n) is a pseudoprime to base 3, then a(n+1) is a pseudoprime to base 3.
Note that a(n) divides a(n+1)-1 for every n.
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