Number Recreations

Shyam Sunder Gupta
Principal Chief Engineer,
Southern Railway,
Chennai, India-600003
Telephone: (044) 25353030(O)

What is New? (Update 4 November, 2015)

The page on Fascinating Triangular Numbers updated and enlarged.

CYF NO. 46 results by Al Zimmermann and Brian Trial given.

CYF NO. 41 results by Brian Trial and Shyam Sunder Gupta given.

Do You Know?

There can not be four triangular numbers in arithmetical progression.

Can You Find?

CYF NO. 47
Five even or five odd distinct positive integers such that the sum of any pair of numbers is a perfect square.

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 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 4th November, 2015.


Copyright 2001-2015 Shyam Sunder Gupta. All rights reserved.