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A199192
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Primes of the form 3^(2n-3)+3^(n-1)+1.
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2
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7, 37, 271, 2269, 19927, 129159847, 1162320517, 49269609804781974450852068861184694669, 589881151426658740854227725580736348850640632297373414091790995505756623268837
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