Shyam Sunder Gupta
Principal Chief Engineer,
North Western Railway,
Jaipur, India302017
Telephone: (0141) 2725871(O)
email: guptass@rediffmail.com
http://www.shyamsundergupta.com/
What is New? (Update 17 December, 2017) A new page on Amazing Number 108 added. The page on Fascinating Triangular Numbers updated and enlarged. DO YOU KNOW (25 October, 2006) Comments by Al Zimmermann given. DO YOU KNOW (30 October, 2016) Comments by Al Zimmermann given. Prime curios 5, 7, 216, 1333333 and 15423094826093 added. 
Do You Know?270 is the smallest positive integer such that it has divisors ending with every decimal digit i.e. divisors ending in 0,1,2,3,4,5,6,7,8 and 9. 
Can You Find?CYF NO. 49 The smallest Abundant number which is also pseudoprime (base2).email your answer 
Contents
Note: The above topics including many more will be added in due course.

My Contributions in Prime CuriosPrime Curios!  site maintained by G. L. Honaker Jr. and Chris Caldwell

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This page was last updated on 17th December, 2017.
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