Perfect squares end in 1,4,5,6,9 and zero. Nice symmetry.
Especially with the squares of
1 & 9 (5 +/- 4) ending in 1
2 & 8 (5 +/- 3) ending in 4
5 (5 +/- 0) ending in 5
4 & 6 (5 +/- 1) ending in 6
3 & 7 (5 +/- 2) ending in 9
WHAT ABOUT SQUARE ENDINGS?
100, 400, 900, 1600; of course, if a number ends with a zero, its square ends in 00
Is the only other repeated end for a square 44?
144 1444 3844 7744 12544 19044 26244 35344 44944 56644 68644
are all perfect squares
their square roots are (50n +/-12)2 and n = 0,1,2 . . .
For further amusement, 213,444 = 4622, and is the second member of a series (500n +/- 38)2 = . . . 444
The comment is -
These two series should have names