77
x 77
49
4949
49
5929
777777777777
x 777777777777
49
4949
494949
49494949
4949494949
494949494949
49494949494949
4949494949494949
494949494949494949
49494949494949494949
4949494949494949494949
494949494949494949494949
4949494949494949494949
49494949494949494949
494949494949494949
4949494949494949
49494949494949
494949494949
4949494949
49494949
494949
4949
49
604938271603728395061729
Referência:
Kordemsky, Boris A. The Moscow Puzzles: 359 Mathematical Recreations. Scientific American,1992.
Nenhum comentário:
Postar um comentário