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A119572
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a(n) = (2^(2^n) + 1 + 2^(2^(n + 1) - 1) + 1)/2
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0
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3, 7, 73, 16513, 1073774593, 4611686020574871553, 85070591730234615875067023894796828673, 28948022309329048855892746252171976963487637349870610241596083305694166515713
(list; graph; refs; listen; history; internal format)
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