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A293626
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Numbers of the form (2^(2p) + 1)/5, where p is a prime > 5.
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1
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3277, 838861, 13421773, 3435973837, 54975581389, 14073748835533, 57646075230342349, 922337203685477581, 3777893186295716170957, 967140655691703339764941, 15474250491067253436239053, 3961408125713216879677197517, 16225927682921336339157801028813
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OFFSET
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1,1
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COMMENTS
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Rotkiewicz proved that all the terms in this sequence are Fermat pseudoprimes to base 2 (A001567).
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LINKS
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EXAMPLE
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3277 = (2^(2*7) + 1)/5 is the first term, corresponding to the prime p = 7.
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MATHEMATICA
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p = Select[Range[7, 60], PrimeQ]; (2^(2p) + 1)/5
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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