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A133067
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Perfect numbers divided by 2, minus 1.
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0
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2, 13, 247, 4063, 16775167, 4294934527, 68719345663, 1152921504069976063, 1329227995784915872327346307976921087, 95780971304118053647396689042151819065498660774084607
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OFFSET
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1,1
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LINKS
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FORMULA
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EXAMPLE
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a(3)=247 because the 3rd perfect number is 496 and 496/2 is 248. a(3)=248-1.
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MATHEMATICA
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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