Shyam Sunder Gupta
IRSE,
Director(Railways and Metros),
Consulting Engineers Group, Jaipur, India302017
email: guptass@rediffmail.com
http://www.shyamsundergupta.com/
What is New? (Update 17 June, 2020) The page on Rare Numbers updated (including list up to 10^{23}). Prime curios 11, 1427, 44936, 120689, 132882, 480585, 206913578, 511733945 and many more added. 
Do You Know?The product of four consecutive positive integers can not be equal to product of two consecutive positive integers. 
Can You Find?CYF NO. 53 The two primes p and q such that sum of primes from p to q is equal to product of p and q, where q > p > 10.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 June, 2020.
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