Archive for May 2011
The answer is Ï€^2/6: What’s the question?
Posted by: Gary Ernest Davis on: May 11, 2011
The Basel problem One question that has as an answer was posed by Pietro Mengoli in 1644: “What is the value of ?” This became known as the Basel Problem, and Leonhard Euler solved it and announced his solution in 1735 when he as 28 years old. Euler showed – at first not entirely rigorously […]
A curious number exploration
Posted by: Gary Ernest Davis on: May 6, 2011
Benjamin Vitale (@BenVitale) tweeted that he followed 203 people on Twitter and is a prime number. Alex Bogomolny (@CutTheKnotMath) observed that if (digits base 10) then has a factor of unless one of . A quick computational search (using Mathematicaâ„¢) yields the following numbers (base 10 digits) for which is prime: 10, 20, 203, 230, […]
Tags: prime numbers
