World!Of
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Welcome all to this maths info-structure !
Allow me to present various recreational topics from the
WORLD!OF NUMBERS

In this well-filled website you'll find a multitude of facts and figures
about topics from the  World!Of Numbers . Don't look for a logical
order. It is an amalgamation of randomly gathered numbers, curios,
puzzles, palindromes, primes, gems, your much valued contributions
and more general information.   Enjoy! Patrick De Geest

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 Introduction via links to palindrome sites
 Some thematic websources
 Various palindromic number records
 3 Palindromic triangulars
 The most beautiful palindromic triangular
 Exhaustive list of palindromic triangulars
 Subsets of palindromic triangulars
 Details Part A from [1] to [49]
 Details Part B from [50] to [99]
 Details Part C from [100] to [149]
 Palindromic tetrahedrals
 Details of palindromic tetrahedrals
 4 Palindromic squares
 Exhaustive list of palindromic squares up to length 31
 List of palindromic squares from length 32
 Subsets of palindromic squares
 Details of palindromic squares
 Extraordinary squares and powers (non-palindromic allowed)
 Palindromic cubes
 Details of palindromic cubes
 5 Palindromic pentagonals
 Details of palindromic pentagonals
 6 Palindromic hexagonals
 Details of palindromic hexagonals
 7 Palindromic heptagonals
 Details of palindromic heptagonals
 8 Palindromic octagonals
 Details of palindromic octagonals
 9 Palindromic nonagonals
 Details of palindromic nonagonals
 Centered palindromic polygonals
 Palindromic primes pages info overview
 Palindromic primes page 1
 Palindromic primes page 2
 Palindromic primes page 3
 Palindromic primes page 4
 Palindromic primes page 5
 Palindromic primes page 6
 Assignment 2
 Assignment 3
 Palprimes where the sum over all digits is a minimum
 Multiple Palprimes “Four in a row”
 Circular primes
 Smoothly Undulating Palindromic Primes - SUPP's
 SUPP's - Sorted By Length
 Palindromic Wing Primes - PWP's
 PWP's - Sorted By Length
 Palindromic Plateau and Depression Primes - PDP's
 PDP's - Sorted By Length
 PDP's - Factorizations of 133...331
 PDP's - Factorizations of 311...113
 Palindromic Merlon Primes - PMP's
 PMP's - Sorted By Length
 The nine digits page 1
 The nine digits page 2
 The nine digits page 3
 The nine digits page 4
 The nine digits page 5
 The nine digits page 6
 The nine digits page 7
 John Abreu's palindrome puzzle
 Palindromic products of two ninedigital numbers
 Palindromic products of two pandigital numbers
 List of palindromes as products of two pandiagonals
 Palindromic pronic numbers of the form n(n+1)
 Palindromic quasipronic numbers of the form n(n+2)
 Palindromic quasipronics of the form n(n+X)
 Palindromic incremented squares of the form n^2+1
 Palindromic incremented squares of the form n^2+X
 Palindromic decremented squares of the form n^2–X
 Palindromic quasi_over_squares of the form n^2+(n+1)
 Details of palindromic quasi_over_squares
 Palindromic quasi_over_squares of the form n^2+(n+X)
 Palindromic quasi_under_squares of the form n+(n+1)^2
 Palindromic sums of squares of consecutive integers
 Powers of Consecutives Summing to Palindromes
 Palindromic sums of cubes of consecutive integers
 Palindromic sums of powers of consecutive primes
 Various palindromic sumpatterns
 Sum of first n 'type of numbers' is palindromic
 More palindromic products of integer sequences
 Palindromic products of integers with their reversals
 Palindromic Pythagorean triples
 Palindromic subsets of concatenated sequences
 Beyond base 10
 Palindromic numbers beyond base 10 page 1
 Palindromic numbers beyond base 10 page 2
 Palindromic numbers beyond base 10 page 3
 Palindromic numbers beyond base 10 page 4

Factorisations

 Home primes - Repeated factorisation of concatenated prime factors
 The concatenated numbers from Sm1 up to Sm200
 The reversed concatenations from Rsm1 up to Rsm200
 The repunit prime factors from R1 up to R100
 Facts and figures about 2002 the last palindromic year
 Facts and figures about 2002 continued...
 List of the 4260 left-truncatable primes
 Squares containing at most three distinct digits
 Finding Tridigital Squares using 'Quadratic Residues'
 Numbers whose digits occur with same frequency - Cl. P2
 Classification P3
 Classification P4
 Classification P5
 Sets of 3 composites in bidirectional SOPF pro-/retrogression
 The Prime Brier Brothers Project
 Search for the first PRP megaprime of the form 10^999999+y
 Output data of 10^999999 + y (y < 500000 )
 Doublechecking PRP candidates
 An ongoing project
 Border PRP's around 'Powers of ten'
 Table in plain text from 00000 to 04999
 Table in plain text from 05000 to 09999
 Table in plain text from 10000 to 14999
 Table in plain text from 15000 to 19999
 Table in plain text from 20000 to 24999
 Table in plain text from 25000 to 29999
 Table in plain text from 30000 to 34999
 Table in plain text from 35000 to 99999
 Packed list of all PRP's of the form 10^n – d up to 30000
 Packed list of all PRP's of the form 10^n + d up to 30000
 Discontinued
 What was new in my website?
 Whatsnew? archive of 2002
 Whatsnew? archive of 2001
 Whatsnew? archive of 2000
 Some handy tools
 Multiple precision JavaScript calculator
 Iso Latin I & Unicode character set
 All the 140 colourful exotic color names
 Some loose ends
 Some old photographs of the editor of this website
 Google Search Pop Up from this very homepage
 Pop Up from 'square.htm' & Wonplate 74 - Probability
 Pop Up from Wonplate 17 about DNA
 Pop Up from Wonplate 17 - Analyse
 Pop Up from Wonplate 16 - Small Puzzle
 Pop Up from 'square.htm' on pseudo palindromes
 Worksheet - Palindromic Sums of Powers
 Worksheet - Sequence from Wonplate 197
 Worksheet A from Wonplate 197
 Worksheet B from Wonplate 197

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of numbers !
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For the prime fans !

Integer Sequences

To look up a number sequence in Sloane's
On-Line Encyclopedia of Integer Sequences,
enter it here and click "Submit":

To list all OEIS submissions from Patrick De Geest
To list all OEIS sequences with keywords Palindrome or Palindromic
Prime Curios! Prime Puzzles The Digits Project Richard Phillips