The Beauty of Number 6 and Number 7 in building a number pyramid

The Beauty of Number 6 and Number 7 in building a number pyramid

6 x 7 = 42
66 x 77 = 4422
666 x 777 = 444222
6677 x 7777 = 44442222
66666 x 77777 = 4444422222
666666 x 777777 = 444444222222
6666666 x 7777777 = 44444442222222
66666666 x 77777777 = 4444444422222222
666666666 x 777777777 = 444444444222222222