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#37 by Alois P. Heinz at Mon Feb 06 17:34:21 EST 2023
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#36 by Alois P. Heinz at Mon Feb 06 14:25:09 EST 2023
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#35 by Michel Marcus at Mon Feb 06 14:23:18 EST 2023
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#34 by Michel Marcus at Mon Feb 06 14:23:16 EST 2023
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E. Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/CenteredPolygonalNumber.html">Centered Polygonal Numbers</a>
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proposed
editing
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#33 by Nikolaos Pantelidis at Mon Feb 06 14:07:20 EST 2023
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#32 by Nikolaos Pantelidis at Mon Feb 06 14:07:16 EST 2023
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E.g.f.: exp(x)*(1 + 23*x^2/2)-1. - Nikolaos Pantelidis, Feb 06 2023
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approved
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#31 by Peter Luschny at Sun Jun 21 05:38:00 EDT 2020
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#30 by Joerg Arndt at Sun Jun 21 01:57:39 EDT 2020
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#29 by Amiram Eldar at Sun Jun 21 01:50:01 EDT 2020
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#28 by Amiram Eldar at Sun Jun 21 01:33:26 EDT 2020
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From Amiram Eldar, Jun 21 2020: (Start)
Sum_{n>=1} 1/a(n) = 2*Pi*tan(sqrt(15/23)*Pi/2)/sqrt(345).
Sum_{n>=1} a(n)/n! = 25*e/2 - 1.
Sum_{n>=1} (-1)^n * a(n)/n! = 25/(2*e) - 1. (End)
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approved
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