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A326051
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1/2 times 3-perfect (triply perfect, tri-perfect, triperfect or sous-double) numbers: a(n) = A005820(n)/2.
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7
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OFFSET
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1,1
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COMMENTS
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If any odd perfect numbers exist, they should occur in this sequence, unless it is already complete, as some people believe. Please see comments and links in A005820.
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LINKS
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FORMULA
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CROSSREFS
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KEYWORD
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nonn,more,hard
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AUTHOR
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STATUS
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approved
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