Joined December 2021
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Shyam Sunder Gupta retweeted
Find the sum of the digits appearing in the integers
1,2,3,... up to 10^n-1.
For detailed solution,
Refer the book "Creative Puzzles to Ignite your mind" published by Springer and featured in The Guardian (UK).
amazon.com/Creative-Puzzles-…
theguardian.com/science/2023…
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Shyam Sunder Gupta retweeted
Creative puzzles to ignite your mind
x.com/i/status/2055871040312…
May 17
Creative Puzzles to Ignite Your Mind (Problem Books in Mathematics)
Cool book at amzn.to/4bevJHB
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Shyam Sunder Gupta retweeted
Using 7 lt and 5 lt jug, find the least number of decanting to divide milk in a 12 lt jug into two equal parts.
For detailed graphical solution,refer
"Creative Puzzles to Ignite your mind" published by Springer and featured in The Guardian (UK).
amazon.com/Creative-Puzzles-…
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(105, 171) is the only known pair of triangular numbers such that sum, difference, and product of numbers in the pair are also triangular.
Refer, "Exploring the Beauty of Fascinating Numbers" published by Springer.
amazon.com/Exploring-Beauty-…
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108 is the smallest number whose divisors when taken together contain every digit at least once.
For more refer, "Exploring the Beauty of Fascinating Numbers", published by Springer (March 25) and mentioned in Guardian (UK):
theguardian.com/science/2025…
amazon.com/Exploring-Beauty-…
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The number of primes up to 1512 is 1! * 5! * 1! * 2!
Refer the book "Exploring the Beauty of Fascinating Numbers" published by Springer in March 25 (Full of number curiosities, coincidences, and explorable ideas).
amazon.com/Exploring-Beauty-…
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2520 is the smallest EPRN.
It is the largest highly composite number that is a divisor of all the following highly composite numbers.
For more on EPRN and 2520, refer the 600 plus book "Exploring the Beauty of Fascinating Numbers".
amazon.com/Exploring-Beauty-…
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Most impressive prime numbers:
linkedin.com/posts/shyam-sun…
‘Spektrum der Wissenschaft’ (Germany), reported one of my findings "17350-digit memorable prime".
spektrum.de/kolumne/wer-find…
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There are infinity of numbers such as .
1233 = 12^2 33^2
8833 = 88^2 33^2
(Note 88 12 = 100).
5882353 = 588^2 2353^2
94122353 = 9412^2 2353^2
(Note 588 9412 = 10000.
Refer, "Exploring the Beauty of Fascinating Numbers" published by Springer.
amazon.com/Exploring-Beauty-…
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Shyam Sunder Gupta retweeted
A popular math blogger
Pat Ballew says about this book:
"If you like math, or if you have a child/friend/neighbor/spouse/other who likes math, this is a perfect gift ...
pballew.blogspot.com/2025/08…
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Shyam Sunder Gupta retweeted
The book was featured in The Guardian paper(UK):
theguardian.com/science/2025…
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Shyam Sunder Gupta retweeted
The Superstition of Number 13 and Amazing Facts:
The sum of all the prime numbers up to 13 is equal to the 13th prime number, and this is the largest such number.
linkedin.com/posts/shyam-sun…
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Shyam Sunder Gupta retweeted
The largest gap between two like digits in first one billion digits of pi is 195 and that is between two 8's. For more on such pi curiosities,
Refer 636 page book "Exploring the Beauty of Fascinating Numbers" published by Springer(March 2025).
amazon.com/Exploring-Beauty-…
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Shyam Sunder Gupta retweeted
Kaprekar Triple:
297^3 = 26198073, and
26 198 073 = 297.
For more,
Refer "Exploring the Beauty of Fascinating Numbers" published by Springer(March 25).
amazon.com/Exploring-Beauty-…
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Shyam Sunder Gupta retweeted
Exploring the Beauty of Fascinating Numbers
Mathematics book (636 pages) available at amzn.to/3O0z9G6
x.com/i/status/2064797899901…
Jun 10
Exploring the Beauty of Fascinating Numbers
Mathematics book (636 pages) available at amzn.to/3O0z9G6
Amazon summary: "Organized into 23 chapters, the book contains a large variety of topics: digital root wonders, the elegance of squares, triangular numbers, Smith numbers, amicable numbers, perfect, multiple perfect and sociable numbers, happy numbers, Fibonacci numbers, Lucas numbers, and the Golden ratio, Kaprekar numbers, self-numbers, repunit numbers, equal product of reversible numbers (EPRNs), rare numbers, fascinating factorials, Ulam numbers, mystery of π, cab and vampire numbers, digital invariants and narcissistic numbers, special numbers like autobiographical numbers, Harshad numbers, parasite numbers, polydivisible numbers, Ramanujan numbers, number curiosities such as lucky mistakes, Pascal’s triangle and Pythagorean triplets."
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