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A066263
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2^n+1 has just two distinct prime factors.
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1
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5, 6, 7, 9, 10, 11, 12, 13, 17, 19, 20, 23, 28, 31, 32, 40, 43, 61, 64, 79, 92, 101, 104, 127, 128, 148, 167, 191, 199, 313, 347, 356, 596, 692, 701, 1004, 1228, 1268
(list; graph; refs; listen; history; internal format)
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