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A135627
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Perfect numbers minus 1.
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2
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5, 27, 495, 8127, 33550335, 8589869055, 137438691327, 2305843008139952127, 2658455991569831744654692615953842175, 191561942608236107294793378084303638130997321548169215
(list; graph; refs; listen; history; internal format)
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