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new file: oeis-research/Erich Friedman/Squares that remain squares if you decrease every digit by 1/b061844.txt
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| Squares that remain squares if you decrease every digit by 1 | vor 6 Monaten | |
| a(1) = a(2) = 1, a(n) is largest prime factor of concatenation of a(n - 2) and a(n - 1) | vor 2 Jahren | |