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 14 December, 2019) The page on Rare Numbers updated (including list up to 10^{22}). CYF NO. 49 Comments by Daniel Suteu given. CYF NO. 51 Comments by Jens Kruse Andersen given. Prime curios 12, 182, 10342, 49141, 10234567 and many more added. 
Do You Know?The number 665067264 is the largest even number such that the number formed from first n digits is divisible by n^{th}prime. 
Can You Find?CYF NO. 52 The smallest sets of 13, 14 and 15 consecutive primes which are emirps also.email your answer 
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Note: The above topics including many more will be added in due course.

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This page was last updated on 14th December, 2019.
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