The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A255184

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A255184

25-gonal numbers: a(n) = n*(23*n-21)/2.
(history; published version)

#39 by Alois P. Heinz at Mon Feb 06 05:26:06 EST 2023

STATUS

proposed

approved

#38 by Nikolaos Pantelidis at Sun Feb 05 22:57:54 EST 2023

STATUS

editing

proposed

#37 by Nikolaos Pantelidis at Sun Feb 05 22:57:45 EST 2023

FORMULA

E.g.f.: exp(x)*(x + 23*x^2/2). - Nikolaos Pantelidis, Feb 05 2023

STATUS

approved

editing

#36 by Charles R Greathouse IV at Thu Sep 08 08:46:11 EDT 2022

PROG

(MAGMAMagma) k:=25; [n*((k-2)*n-(k-4))/2: n in [0..40]]; // Bruno Berselli, Apr 10 2015

Discussion

Thu Sep 08

08:46

OEIS Server: https://oeis.org/edit/global/2944

#35 by Joerg Arndt at Fri Jan 22 03:29:22 EST 2021

STATUS

reviewed

approved

#34 by Michel Marcus at Fri Jan 22 03:23:07 EST 2021

STATUS

proposed

reviewed

#33 by Amiram Eldar at Fri Jan 22 03:09:44 EST 2021

STATUS

editing

proposed

#32 by Amiram Eldar at Fri Jan 22 03:05:40 EST 2021

FORMULA

Product_{n>=2} (1 - 1/a(n)) = 23/25. - Amiram Eldar, Jan 22 2021

STATUS

approved

editing

#31 by Charles R Greathouse IV at Wed Oct 07 12:08:25 EDT 2015

STATUS

editing

approved

#30 by Charles R Greathouse IV at Wed Oct 07 12:07:55 EDT 2015

PROG

(PARI) a(n)=n*(23*n-21)/2 \\ Charles R Greathouse IV, Oct 07 2015

STATUS

approved

editing