Question

What is the possible number of digits in the squares of 17

Answer 1

3 DIGITS....

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Answer 2

Answer:

contains exactly two different digits are given by 4, 5, 6, 7, 8, 9, 10, 11, 12, 15, 20, ... (OEIS A016069), whose squares are 16, 25 36, 49, 64, ...

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Square Number.

1790, 1, 2, 4, 8, 9, 13, 15, 161880, 1, 4, 7, 9, 10, 13, 1619100, 1, 4, 5, 6, 7, 9, 11, 16, 172060, 1, 4, 5, 9, 16