Perfect squares that end with number which was squaredpic.twitter.com/Y0AuFldkQ9
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They are automorphic numbers. Any number ending in eg 90625 multiplied by any other number ending in 90625 will end in 90625.
Actualy you missed 69 and 29. 162459327^2 = 26393032929292929 ; 639369437^2 = 408793276969696969. Also I checked that there are squares with 500 times repeating xy. I think there are squares with any number of repetitions of xy pattern.(I will think about proof)
121, 484 and 961 are perfect squares "starting with" 1, 4 and 9 that are also perfect squares.
[citation needed]
I don't understand the xyxyxyxy.
Do you understand it is concatenation, not multiplication?
Would have to form a set of all possible numbers in base ten, then look at the expansion series. That’s as far as I can think through it. Would be pretty tough going through all the cases imo.
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