If the last digit of this POSITIVE whole number becomes the first digit, the resulting number is exactly twice as large. My number is the smallest whole number with this property. What is my number? Watch the video for a solution. I'll give you a hint: you are unlikely to solve for the answer by casually guessing it. But a genius might be able to. Legendary mathematician Freeman Dyson apparently heard the problem and instantly replied with the number of digits in the answer.

My blog post for this video:
https://wp.me/p6aMk-5eH

Sources
https://angrystatistician.blog....spot.com/2015/10/an-
https://en.wikipedia.org/wiki/Parasitic_number
https://tierneylab.blogs.nytim....es.com/2009/04/06/fr
https://tierneylab.blogs.nytim....es.com/2009/04/10/pu
https://math.stackexchange.com..../questions/138841/mo
Alex Bellos book "Can You Solve My Problems" https://www.amazon.com/Can-You....-Solve-Problems-Perp

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My Books

"The Joy of Game Theory" shows how you can use math to out-think your competition. (rated 3.9/5 stars on 29 reviews) https://www.amazon.com/gp/product/1500497444

"The Irrationality Illusion: How To Make Smart Decisions And Overcome Bias" is a handbook that explains the many ways we are biased about decision-making and offers techniques to make smart decisions. (rated 5/5 stars on 2 reviews) https://www.amazon.com/gp/product/1523231467/

"Math Puzzles Volume 1" features classic brain teasers and riddles with complete solutions for problems in counting, geometry, probability, and game theory. Volume 1 is rated 4.4/5 stars on 13 reviews. https://www.amazon.com/gp/product/1517421624/

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"40 Paradoxes in Logic, Probability, and Game Theory" contains thought-provoking and counter-intuitive results. (rated 4.3/5 stars on 12 reviews) https://www.amazon.com/gp/product/1517319307/

"The Best Mental Math Tricks" teaches how you can look like a math genius by solving problems in your head (rated 4.7/5 stars on 4 reviews) https://www.amazon.com/gp/product/150779651X/

"Multiply Numbers By Drawing Lines" This book is a reference guide for my video that has over 1 million views on a geometric method to multiply numbers. (rated 5/5 stars on 3 reviews) https://www.amazon.com/gp/product/1500866148/