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A029724
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Odd numbers congruent to 7 mod 8 such that (2^(h(-n)+2)-n) is a square, where h(-n) is the class number.
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7, 15, 23, 31, 39, 47, 55, 63, 71, 79, 87, 103, 127, 135, 151, 175, 183, 199, 207, 223, 247, 255, 271, 295, 343, 367, 375, 463, 487, 511, 583, 727, 751, 823, 847, 967, 1023, 1087, 1255, 1303, 1423, 1527, 2047, 2143, 3063, 3343, 4447, 5503
(list; graph; refs; listen; history; internal format)
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