This week's Puzzler is based on the digit
7.
First you are asked to search for an unusual series of six prime
numbers in arithmetical progression. This special series starts
with the single digit 7 and all the other five primes end in 7.
Next, and more difficult, the problem is to reconstruct the
skeletal sum on the right, where all ten digits from 0 to 9 are
present, once each, on the top and bottom lines, making up a
fraction equal to one-seventh.
Find the solution online >>
