IRSE, FIE, Ex Principal Chief Engineeer, Indian Railways, Author of books:Creative Puzzles to Ignite Your Mind and Exploring the Beauty of Fascinating Numbers.
Jaipur, India
Joined December 2021
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Shyam Sunder Gupta retweeted
Creative Puzzles to Ignite Your Mind (Problem Books in Mathematics)
Cool book at amzn.to/4bevJHB
The book
"Creative Puzzles to Ignite your mind" published by Springer was featured in The Guardian (UK).
theguardian.com/science/2023…
Shyam Sunder Gupta retweeted
The number of the beast 666:
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The number of the beast 666:
linkedin.com/posts/shyam-sun…
Shyam Sunder Gupta retweeted
There are 4260 left-truncatable primes:
The largest is the 24-digit 357686312646216567629137.
There are 83 right-truncatable primes.
The largest is the 8-digit 73939133.
Shyam Sunder Gupta retweeted
The most wanted prime:
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The most wanted prime:
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Shyam Sunder Gupta retweeted
The Online Encyclopedia of Integer Sequences (OEIS):
The book "Exploring the Beauty of Fascinating Numbers" published by Springer Singapore (March 2025), is cited in 200 integer sequences in OEIS.
oeis.org/search?q=Exploring+…
Shyam Sunder Gupta retweeted
The known non-trivial examples of factorials that can be represented as product of distinct factorials are:
10! = 6! x 7! = 3! x 5! x 7! and
16! = 2! x 5! x 14!
For more,
Refer "Exploring the Beauty of Fascinating Numbers" published by Springer.
amazon.com/Exploring-Beauty-…
The Online Encyclopedia of Integer Sequences (OEIS):
The book "Exploring the Beauty of Fascinating Numbers" published by Springer Singapore (March 2025), is cited in 200 integer sequences in OEIS.
oeis.org/search?q=Exploring+…
The known non-trivial examples of factorials that can be represented as product of distinct factorials are:
10! = 6! x 7! = 3! x 5! x 7! and
16! = 2! x 5! x 14!
For more,
Refer "Exploring the Beauty of Fascinating Numbers" published by Springer.
amazon.com/Exploring-Beauty-…
Shyam Sunder Gupta retweeted
Lucky Mistakes:
It is a well-known joke that the illogical cancellation of the digit “6” in the following examples yields the correct answers:
16/64 =1/4,
26/65 = 2/5
For more, read
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Shyam Sunder Gupta retweeted
Rail Heritage Museum in Bikaner(India):
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Shyam Sunder Gupta retweeted
Polydivisible numbers:
An n-digit number is called polydivisible if the numbers formed from its first n digits are divisible by n. 3816547290 is the only polydivisible number that is pandigital.
refer “Exploring the Beauty of Fascinating Numbers”.
linkedin.com/posts/shyam-sun…
Shyam Sunder Gupta retweeted
The Number of the Beast 666:
linkedin.com/posts/shyam-sun…
US Route 666, known as 'The Highway of the Beast', was renamed Route 491 in 2003.
amazon.com/Exploring-Beauty-…
Rail Heritage Museum in Bikaner(India):
linkedin.com/posts/shyam-sun…
Shyam Sunder Gupta retweeted
666 is a Smith number because the digit sum of 666, i.e., 6+6+6=18, is equal to the sum of the digits of its prime factors, (666=2×3×3×37), i.e., 2+3+3+3+7=18.
For more,
Refer "Exploring the Beauty of Fascinating Numbers" published by Springer(March 25).
amazon.com/Exploring-Beauty-…
Shyam Sunder Gupta retweeted
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The smallest Amicable pair is (220, 284).
No amicable number in any Amicable pair is divisible by 6.
For more on Amicable pairs,
Refer "Exploring the Beauty of Fascinating Numbers" published by Springer(March 25).
amazon.com/Exploring-Beauty-…
Shyam Sunder Gupta retweeted
23! is the least factorial in which the digits 0 to 9 appear at least once.
For more,
Refer "Exploring the Beauty of Fascinating Numbers" published by Springer(March 25).
amazon.com/Exploring-Beauty-…
Shyam Sunder Gupta retweeted
Kaprekar's Self Numbers
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