Another brick (in the wall)
Now we would like to make bricks (to throw them in Putin's face?) By superimposing two numbers in a «correct» way. This is for instance a 2-integer brick we accept: 1291951 9371733 Why? Because, when we read vertically, we encounter only prime numbers. They are (left to right): 19, 23, 97, 11, 97, 53, 13 . Note that neither 1291951, nor 9371733 are primes – we are only interested in vertical 2-digit (sometimes 1-digit) primes. Here are four bricks we accept – and four we don’t: We accept : a b c d 14 17 513 23567898 391 213 37 13973 We reject : e f g h 14 17 413 235678980 191 913 17 139735 Why ? a : the leftmost vertical integer is see...