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 7 July, 2015)

The page on Fascinating Triangular Numbers updated and enlarged.

The page on Curious Properties of 153 updated.

The page on Unique Numbers updated.

CYF NO. 43 solution by Al Zimmermann given

CYF NO. 26 Comments by Mauro Fiorentini given.

CYF NO. 15 Comments by Mauro Fiorentini given.

CYF NO. 7 Comments by Mauro Fiorentini given.

Do You Know?

541993 = 159211275242599 and 15921 + 12752 + 42599 = 71272
712723 = 362040234715648 and 36204 + 02347 + 15648 = 54199

Can You Find?

CYF NO. 46
Five distinct Perfect Powers in Arithmetic Progression with smallest common difference.

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 7th July, 2015.


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