The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A028386 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A028386

Numbers k such that k*(3k-1)/2 is a pentagonal palindrome.
(history; published version)

#11 by N. J. A. Sloane at Sun Aug 11 14:41:29 EDT 2024

LINKS

P. De Geest, <a href="httphttps://www.worldofnumbers.com/penta.htm">Palindromic Pentagonals</a>

Discussion

Sun Aug 11

14:41

OEIS Server: https://oeis.org/edit/global/2998

#10 by Alois P. Heinz at Sun Oct 06 17:49:12 EDT 2019

STATUS

reviewed

approved

#9 by Andrew Howroyd at Sun Oct 06 17:42:29 EDT 2019

STATUS

proposed

reviewed

#8 by Jon E. Schoenfield at Sun Oct 06 17:30:19 EDT 2019

STATUS

editing

proposed

#7 by Jon E. Schoenfield at Sun Oct 06 17:30:10 EDT 2019

EXTENSIONS

More terms from Patrick De Geest, November Nov 15 1998

STATUS

proposed

editing

Discussion

Sun Oct 06

17:30

Jon E. Schoenfield: Okay, thanks!

#6 by Jon E. Schoenfield at Sun Oct 06 16:33:58 EDT 2019

STATUS

editing

proposed

Discussion

Sun Oct 06

17:04

Jon E. Schoenfield: (I think I've asked about a similar situation before, but I apologize that I don't remember the answer.)  :-(

17:17

Michel Marcus: why not say 15 : middle of the month ??

#5 by Jon E. Schoenfield at Sun Oct 06 16:33:40 EDT 2019

NAME

Numbers n k such that nk*(3n3k-1)/2 is a pentagonal palindrome.

AUTHOR

Patrick De Geest, extended 11/98.

EXTENSIONS

More terms from Patrick De Geest, November 1998

STATUS

approved

editing

Discussion

Sun Oct 06

16:33

Jon E. Schoenfield: "November 1998"? or "Nov 1998"?

#4 by Charles R Greathouse IV at Fri Aug 24 10:47:35 EDT 2012

AUTHOR

_Patrick De Geest (pdg(AT)worldofnumbers.com), _, extended 11/98.

Discussion

Fri Aug 24

10:47

OEIS Server: https://oeis.org/edit/global/1824

#3 by N. J. A. Sloane at Sat Jun 12 03:00:00 EDT 2004

NAME

Numbers n such that n(3n-1)/2 is a pentagonal palindrome.

KEYWORD

nonn,base,new

#2 by N. J. A. Sloane at Fri May 16 03:00:00 EDT 2003

LINKS

P. De Geest, <a href="http://www.pingworldofnumbers.be/~ping6758com/penta.htm">SourcePalindromic Pentagonals</a>

KEYWORD

nonn,base,new

AUTHOR

Patrick De Geest (Patrick.DeGeest@pingpdg(AT)worldofnumbers.becom), extended 11/98.