The letters A-H are different digits from 1 to 9.
Read from left to right and top down, the four numbers formed are primes.
There is not just one solution. (Flipping along the diagonal A-H does not present a different solution).
Suppose "0" is allowed, and A cannot have that value, what other unique solutions are available?
(In reply to
part 1 computer solution by Charlie)
As nearly always, Charlie, you are very thorough.
I would like to comment on your statement --
"If any had 6 primes (using the middle rows) those would have been flagged via an asterisk, but none were.". As all 2+digit primes end in either 1, 3, 7 or 9 -- one of four distinct digits -- then using the middle row to find six primes is indeed impossible as there would need be for five distinct digits to end the primes: C, E, F, G and H.
|
|
Posted by Dej Mar
on 2009-07-12 02:07:23 |
re: part 1 computer solution
