Something interesting...

Is there a reason why the last digits of the squares of the numbers from 19 form a palindrome? (149656941) I'm just curious

hello! it's because you can think of 9 as (101), 8 as (102) and so on. so basically, if numbers 14 are "x" then numbers 69 are "10x". and if you expand (10x)^2, you'll find that it's 10^220x+x^2 and so the last digit of (10x)^2 is just going to be the same as the last digit of x^2. hope that helped.

@genuineopossum to clarify, 9 is supposed to be (10x) for 1 and 8is supposed to be (10x) for 2 and so on.