December 20, 2001 
Various palindromic observations from Enoch Haga WONplate 121 (new) 
December 17, 2001 
Shyam Sunder Gupta started a new website Number Recreations This is great! Let us pay him a visit. Welcome, dear like minded number lover! 
December 1, 2001 
Charlton Harrison found a new record binarydecimal palindrome
110 0010111100 0010101010 1101000011 1010000010
0000101110 0001011010 1010100001 1110100011 =
7475703079870789703075747
The binary string contains 83 digits ! the complete list 
November 11, 2001 
Enoch Haga's new book is out !
"Exploring Prime Numbers on Your PC and the Internet"
WONplate 120 (new) Haydn, Hindemith, others(?) composed palindromic music !
WONplate 19 (update) 
November 6, 2001 
Playing around with nine & pandigitals in other bases !
WONplate 119 (new) Eric W. Weisstein's MathWorld has returned. This is great and fantastic news. Welcome back, dear encyclopedist! 
October 22, 2001 
Have you ever... palindromes in the Golden String !
WONplate 118 (new) 
October 19, 2001 
Hans Rosenthal found (prime proved) a new 4859digit Smoothly Undulating Palindromic Prime (SUPP for short)
9(89)_{2429} = (98*10^{4859}89)/99
Compare this with L. C. Noll's old record of 2883 digits !
It took Hans more than 1847 hours to finish the proof. 
October 12, 2001 
Semiprimes are composites with exactly two prime factors.
Can you find four consecutive semiprimes ?
WONplate 117 (new) 
October 10, 2001 
Ever larger numbers composed of ODD digits (iDem DitO
for their prime factors) are asked. One example :
15995731573 = 1153 * 1933 * 7177
WONplate 116 (new) The pandigital version of WONplate 97. 1023687954 * 2901673548 = 2970408257528040792
WONplate 115 (new) 
October 5, 2001 
David Broadhurst and Harvey Dubner announced via the NMBRTHRY bulletin board a new palindromic prime N = (1989191989)_{1560}1 containing 15601 digits.
This is not a new record however this palindrome is of a more varied form and hence considerably
more demanding to prove ! 
September 24, 2001 
More palindromic quotients through pandigital numerators .
WONplate 114 (new) 
September 23, 2001 
I found many more sets of two ninedigital numbers that makes a palindromic product !
WONplate 97 (updated) 
September 3, 2001 
WONplate 113
Jim Fougeron's titanic prime uses only palindromes.
WONplate 112
Terry Trotter blended different concepts
in a most beautiful pattern. 
July 16, 2001 
FOUR IN A ROW , this time ! All new WONplates.
WONplate 111
Analogical Reasoning (by Klaus Brockhaus) and more
Pattern Power, leading to the Number of the Beast.
WONplate 110
A. Murthy's integer sequence A061604 inspired me
to create this Pandigital Programming Challenge.
WONplate 109
723121327 a peculiar palprime from Carlos Rivera.
WONplate 108
A palindrome story for 89 told by Terry Trotter. 
July 9, 2001 
Preon sent me the complete list of all the Ninedigital 'Kordemsky' Divisions.
WONplate 107 (new) 
June 25, 2001 
Hugo Sánchez provides 29 extra
palindromic patterns
arranged in two categories :
Productos Palindrómicos
Curiosidades con el número 333667 (primo)
WONplate 106 (new) 
June 17, 2001 
Hans Havermann extended the list of Twin Prime Pairs
summing to palindromes. Many nice patterns emerges...
WONplate 105 (new)
WONplate 104 (new) A palindromic error, this one ! 
June 16, 2001  My page Smoothly Undulating Palindromic Primes (SUPP for short) underwent a major upgrade. This was accomplished thanks to Hans Rosenthal's contribution of probable primes up to 20001 digits, bringing this collection to the point where it will serve as a standard reference work for this kind of numbers, at least that is what we aspire! 
June 15, 2001 
Roberto Botrugno sent in a type Psopf record (length 62)
Set of three composites in bidirectional 'Sum Of Prime Factors' progression/retrogression 
June 3, 2001 
Jeff Heleen provided a nice list with polygonals with palindromic sides, rank and number but can't remember whether it's exhaustive or not... can you verify ?
WONplate 103 (new) 
June 2, 2001 
On May 31 2001, I (pdg) found a second record palindromic triangular of length 42. basenumber k=775.781.766.082.836.455.602 with k(k+1)/2= 300.918.674.293.302.389.819^{}918.983.203.392.476.819.003 
May 28, 2001 
Brian Wallace wonders about triangular numbers containing all 6's.
WONplate 102 (new) 
May 27, 2001 
Hans Havermann made an impressive contribution to my webpage sumprime.htm
Palindromic Sums of Powers of Consecutive Primes 
May 20, 2001 
Pete Leadbetter broke Mike Bennett's record from 1998 by finding a new record palindromic square of 52 digits.
64897400105515621177314682 ^{ 2} =
42116725404553789587188699_{}99688178598735540452761124
Definition of a new notion Intrinsic kpalindromic numbers
WONplate 101 (new) 
May 15, 2001 
A Palindrome Question from Maria Gerardina Bulanon
WONplate 100 (new) 
May 14, 2001 
Harvey Dubner found a new record set of three 2001 digit Palindromic Primes in Arithmetic Progression.
WONplate 99 (new) 
May 1, 2001 
Integer 6643 joins the World!Of Palindromes but not through our trustworthy base 10 numbersystem.
WONplate 98 (new) 
April 18, 2001 
Exactly one year after my previous discovery I (pdg) found a new record Palindromic Triangular basenumber k=585.863.634.063.453.017.106 with k(k+1)/2= 171.618.098.859.017.793.192^{}291.397.710.958.890.816.171 
April 10, 2001 
How many palindromes can you find that are the products of two ninedigital numbers ?
WONplate 97 (new) 
April 9, 2001 
A follow up to WONplate 36 and a ninedigital variation
WONplate 96 (new) 
April 5, 2001 
A new record Smoothly Undulating Palindromic Prime has been proved rigorous prime by Landon Curt Noll. This SUPP has a length of 2883 digits 3(73)_{1441} See also Prime Curios! 37373...37373 
March 26, 2001 
Janean Wilson asked for the largest ninedigital number being the product of three 3digit integers. WONplate 95 (new) 
March 12, 2001 
Sonja Sharp's puzzling palindromic sequence... WONplate 94 (new) 
March 10, 2001 
Today I found the smallest multiplier of 8181 in order to arrive at a palindromic product. See WONplate 36 8181 * 1173450678278939 = 9599999998999999959 The next challenge will now be for integer 818181 ! 
March 2, 2001 
Palindromic Patterns using Odd and Even tiles.
Never say NEVER ODD OR EVEN again !
A contribution from Wendy Klassen WONplate 93 
February 26, 2001 
I need more palindromes in the factorial base ! ... WONplate 92 (New Topic) WONplate 89 (Updated) 
February 23, 2001 
A new conjecture sees the daylight ! There ain't a larger
than 919 ... 929 Primefree Palindrome Interval ...
WONplate 91 
February 12, 2001 
Jeff Heleen computed, using UBASIC, all the
Smoothly Undulating Palindromic Primes
smaller than 843 digits in length.
Dear number cruncher, can you break C. Rivera's record ?
A SUPP of length 1979 1(21)_{989} 
February 10, 2001 
The Nine Digits section has been rearranged
into three pages and a few new topics were added.
ninedigits.htm the most recent page
ninedig2.htm the second page
ninedig1.htm the first page

January 30, 2001 
Smallest multipliers to make a number palindromic.
E.g. 81 * 12345679 = 999999999
E.g. 8181 * ? = ?
A topic with quite a mathematical story...
WONplate 36 
January 25, 2001 
Jaime Ayala and his son Jaimito submitted a beautiful sequel to the 3x3 palindromic &
'Sophie Germain' magic squares of WONplate 87
Harvey Dubner announces two palindromic prime record.
•Three titanic palprimes in arithmetical progression
In fact a rediscovery as Warut Roonguthai
found this set already a year ago...
•Six consecutive palprimes in arithmetic progression
WONplate 90 
January 14, 2001 
A new record of 14 million digits by Jason Allen Doucette
The 196 Palindrome Quest
WONplate 4

January 13, 2001 
Kiwoo Song sent me (way back in '99) an intriguing theorem about factorials and binary numbers. WONplate 89 Marks R. Nester investigated palindromic structures. Back to basics... WONplate 88 Updated wonplate 22 about palindrome 1881. WONplate 22 
January 9, 2001 
A nostalgic Jeff Heleen sheds a retrospective view at the year 1996 and rediscovers some palindromic primes.
WONplate 5 
January 5, 2001 
Jaime Ayala submitted a nice 3x3 palindromic & 'Sophie Germain' pair of magic squares.
Carlos Rivera added some extra puzzle challenges.
WONplate 87 
January 3, 2001 
A new palindromic prime curio !
WONplate 86 