Number Recreations

Shyam Sunder Gupta
Former Principal Chief Engineer,
North Western Railway, Jaipur, India-302017

What is New? (Update 28 April, 2024)

Do You Know?

    A prime factorization in which each of the ten digits from 0 to 9 appear just once:
    28651 = 7 * 4093

Can You Find?

CYF NO. 60
A multidigit palindromic number which can be represented as the product of three consecutive numbers except the following: 474474 = 77 * 78 * 79

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

I ranked second among the prime curios submitters in the world, with more than 1300 prime curios that list interesting things about prime numbers.

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.

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 28th April, 2024.

Copyright 2024-2025 Shyam Sunder Gupta. All rights reserved.