Are there infinitely many Mama's numbers and no Papa's numbers? – math.stackexchange.com

Are there infinitely many Mama's numbers and no Papa's numbers? – math.stackexchange.com

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Just playing with square numbers, I made an interesting observation. $$11\times 11=121$$ $$12\times 12=144$$ $$13\times 13=169$$ $$.$$ $$.$$ $$.$$ $$20\times 20=400$$ $$21\times 21=441$$ $$.$$ $$.$$ ...

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