Number Recreations

Shyam Sunder Gupta
Executive Director Track(P),
141, Rail Bhawan, Ministry of Railways,
New Delhi, India-110001
Telephone: (011) 23382619(O), 23368426(R)

What is New? (Update 6 October, 2014)

The page on Fascinating Factorials added.

CYF NO. 11 solution by David Harrison for a difficult and highly computational problem given.

CYF NO. 44 solution by Fred Schneider given.

CYF NO. 31 Comments by Paul Cleary given.

Do You Know?

48 = 82 - 42
484848 = 8482 - 4842
4848484848 = 848482 - 484842
48484848484848 = 84848482 - 48484842and so on.

Can You Find?

CYF NO. 45
The smallest set of seven Consecutive Palindromic Primes in Arithmetic Progression.

email your answer


Note: The above topics including many more will be added in due course.


My Contributions in Prime Curios

Prime Curios! - site maintained by G. L. Honaker Jr. and Chris Caldwell

My Favorite Links

  • Magic Squares,Magic Stars and Other Interesting number patterns by Harvey Heinz
  • Mudd Math Fun Facts pages
  • On-Line Encyclopedia of Integer Sequences OEIS
  • Math Puzzles
    An interesting site with lot of math recreations by Ed Pegg Jr.
  • World of Trotter Math
    Fascinating work on Number and other math recreations by dedicated mathematics teacher Terry Trotter.

My Favorite Books

Recommended list of books for those interested in Recreational and Computational Number theory
In Association with

The Rail
(January, 2003)

(March, 2003)
The Busy Educator Award
(October, 2003)

Send me e-mail at

This page was last updated on 6th October, 2014.


Copyright 2001-2014 Shyam Sunder Gupta. All rights reserved.