This remarkable 3x3 array, discovered by Saffron Walden
reader Tom Marlow, features a prime number along all three-digit
sequences - horizontally, vertically, diagonally and starting from
either end in each case. The eight primes shown are: 337; 383; 389;
733; 739; 787; 937; and 983.
Tom now asks you to find a similar 3x3 array, again with all
three-digit sequences (forwards or backwards) providing a prime
number where nine different primes are showing, which is apparently
the theoretical maximum.
Find the solution online >>
