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John

Scientist and software developer by day, musician and blogger by night. Check out Mighty Bargain Hunter for my personal finance blog.

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56 If a prime number is reversed, and then appended to itself, why is the result always a composite number? Jan 6 '15
36 What is the next number in this sequence: $1, 2, 6, 24, 120$? Aug 16 '16
33 Is there a better way to find the closest point on a line? Jul 28 '16
24 Why does $r = \cos \theta$ produce a circle? Dec 10 '13
23 Probability the three points on a circle will be on the same semi-circle Jan 6 '14
20 How to prove that either $2^{500} + 15$ or $2^{500} + 16$ isn't a perfect square? Dec 3 '13
19 Number of ways to arrange 5 monkeys in a row? Aug 11 '17
19 Why is vector times vector equal to a number? Jul 6 '18
18 Why is it not possible to generate an explicit formula for Newton's method? Jan 6 '17
16 Can you solve this Diophantine equation really fast: $31x + 30y + 29z = 366$ Jan 3 '17
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