On average, there are as many prime numbers for which the sum of decimal digits is even as prime numbers for which it is odd. This hypothesis, first made in 1968, has recently been proven by ...

If you feel a little odd today, your calendar might explain why. Today’s date, 9/11/13, is a mathematical phenomenon so rare that it only occurs five times every 100 years. This is the last time for ...

This is a preview. Log in through your library . Abstract We prove that every odd number N greater than 1 can be expressed as the sum of at most five primes, improving the result of Ramaré that every ...

A visual puzzle challenges you to find two hidden numbers, 58 and 33, amidst a sea of 53s within 12 seconds. This exercise ...

Mona Lisa’s smile. Mary Lou Retton’s Olympic vault. Mariah Carey’s musical pitch. All are considered perfect. So are the numbers 6 and 28. With feats of artistry and athleticism, perfection lies in ...