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A134709
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Even superperfect numbers divided by 2, minus 1.
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1
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0, 1, 7, 31, 2047, 32767, 131071, 536870911, 576460752303423487, 154742504910672534362390527, 40564819207303340847894502572031, 42535295865117307932921825928971026431
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