Dear Testmaster:
In today's teaser I listed all the possible squares and prime numbers as follows:
Squares: 121 , 144 , 225 , 256 , 361 , 441 and 625
Prime numbers: 113 , 131 , 151 , 163 , 211 , 223 , 233 , 241 , 251 , 263 , 311 , 313 , 331 , 353 , 421 , 431 , 433 , 443 b, 461 , 463 , 521 , 523 , 541 , 563 , 613 , 631 , 641 , 643 , 653 and 661.
The number I see at the front and the number seen by the observer from the front add up to 7 for each dice.
The top number I read is from my right to my left and the reverse is true for the observer.Hence the only square number with its reverse being a prime 361 and if I try this as the top face of three dice , then by trial and error we can get:
152 (reverse reading 251-a prime)
361 (read left to right a square and reverse reading is a pirme)
625 (read left to right is a prime)
Hence we have 2 prime numbers and 2 squares respectively giving us the answer to this etaser as 361 and 625.
Nice and neat problem.
With my best regards
ahmet cetinbudaklar