Shyam Sunder Gupta
IRSE, FIE, FIPWE,
Former Principal Chief Engineer,
North Western Railway, Jaipur, India-302017
email: guptass@rediffmail.com
http://www.shyamsundergupta.com/
What is New? (Update 14 March, 2022) The page on The Number of the Beast 666 added. The page on Fascinating Triangular Numbers updated. CYF NO. 55 Contribution by Al Zimmermann, Maximilian and Giorgos Kalogeropoulos given. Prime curios 17, 25, 94, 111, 587, 1111, 3527, 11956, 122265, 314159, 912673, 962963, 5261941, 5794777, 4592307816, 7775737169, 97959391, 9876541023, 9876542103, 141592653589, 41434547495153, 3637383940414243, 4936251694114916253649, 34149...97531 (39-digits), 72951...12729 (41-digits), 46260...12101(56-digits), 78583...21291 (70-digits), 36132...24361(90-digits), 57137...97531 (209-digits), 12491...11753 (216-digits), 14159...07021 (547-digits), 42574...61941 (948-digits), 76937...11753 (1998-digits), 21309...67281 (5062-digits) and 72180...10631 (6560-digits) added. Integer Sequences A350755, A350368, A350367, A349696, A350304, A350303, A349773, A349722, A349774, A349539 added. |
Do You Know?Except 1 and 9, there is no perfect square with all of its digits odd. |
Can You Find?CYF NO. 56 The smallest amicable pair (m, n) such that digital root of pair sum (i.e. m + n) is 4.email your answer |
Contents
Note: The above topics including many more will be added in due course.
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My Contributions in Prime CuriosPrime Curios! - site maintained by G. L. Honaker Jr. and Chris Caldwell
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Send me e-mail at guptass@rediffmail.com
This page was last updated on 14th March, 2022.
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