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#16 by Amiram Eldar at Tue Apr 11 06:22:29 EDT 2023
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#15 by Amiram Eldar at Tue Apr 11 06:22:27 EDT 2023
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| COMMENTS
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The corresponding harmonic means are 4, 5, 5, 9, 18, 20.
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| STATUS
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approved
editing
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#14 by Joerg Arndt at Fri Dec 18 02:32:59 EST 2020
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#13 by Michel Marcus at Fri Dec 18 00:41:10 EST 2020
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#12 by Chai Wah Wu at Fri Dec 18 00:26:00 EST 2020
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#11 by Chai Wah Wu at Thu Dec 17 23:58:39 EST 2020
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| COMMENTS
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Conjecture: all terms are of the form n*(usigma(n)-1) where usigma(n)-1 is prime. - Chai Wah Wu, Dec 17 2020
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| STATUS
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approved
editing
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#10 by Alois P. Heinz at Sat May 30 19:05:16 EDT 2020
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#9 by Alois P. Heinz at Sat May 30 19:05:12 EDT 2020
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| COMMENTS
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a(5) > 10^10.
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| STATUS
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proposed
editing
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#8 by Giovanni Resta at Sat May 30 17:50:01 EDT 2020
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#7 by Giovanni Resta at Sat May 30 17:49:51 EDT 2020
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| DATA
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228, 1645, 7725, 88473, 20295895122, 22550994580
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| COMMENTS
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a(5) > 10^10, if it exists.
a(7) > 10^12, if it exists. - Giovanni Resta, May 30 2020
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| KEYWORD
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nonn,hard,bref,more,new
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| EXTENSIONS
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a(5)-a(6) from Giovanni Resta, May 30 2020
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| STATUS
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approved
editing
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