Well, I would clearly not last long among the pebble-sorters. I think your criticism is almost right.
Unless we can come up with some scheme whereby there’s only one prime left for particular regions, which I think would require 2*337+3*337+n*2*3 to be prime, which it looks to me like 1697=337*5+12 is.
[I edited in spoiler tags to the above comment.]
Well, I would clearly not last long among the pebble-sorters. I think your criticism is almost right.
Unless we can come up with some scheme whereby there’s only one prime left for particular regions, which I think would require 2*337+3*337+n*2*3 to be prime, which it looks to me like 1697=337*5+12 is.