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A121290
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a(n) = (2^prime(n) - 8)/24 for n>=2.
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2
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0, 1, 5, 85, 341, 5461, 21845, 349525, 22369621, 89478485, 5726623061, 91625968981, 366503875925, 5864062014805, 375299968947541, 24019198012642645, 96076792050570581, 6148914691236517205
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OFFSET
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1,3
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COMMENTS
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Previous name was: (2^(p-3) - 1)/3, where p is an odd prime, i.e., p = A065091.
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LINKS
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MATHEMATICA
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CROSSREFS
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KEYWORD
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nonn,easy,less
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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