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COMMENTS
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Double Wieferich prime pairs are pairs of primes (p, q) such that q^(p-1) == 1 (mod p^2) and p^(q-1) == 1 (mod q^2). a(n) is a subset of A123692(n) = {2, 20771, 40487, 53471161, 1645333507, 6692367337, 188748146801, ...} Primes p such that p^2 divides 5^(p-1) - 1.
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