6×7=42
66×77=5082
666×777=517482
6666×7777=51841482
66666×77777=5185087882
666,666×777,777=518517481482
6,666,666×7,777,777=51851841481482
66,666,666×77,777,777=5185185081481482
666,666,666×777,777,777=518518517481481482
6,666,666,666×7,777,777,777=51851851841481481482
.
66...66(n个6)×77...77(n个7)=42×11...11(n个1)×11...11(n个1)
规律是不断地出现新的重复的数,我认为这是因为不停地乘以11...11的平方的原因