List out i/19:
They form a square, and the sum of each column is the same, 81.
i/7 also have such property:
142857
285714
428571
571428
714285
857142
Any other fractions have such property? What kind of fractions will have such property?
2026-03-25 04:41:10.1774413670
What kind of fraction will have this property?
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You are after numbers that are the decimal period of so-called cyclic numbers.
$7$ and $19$ in this context are called full reptend primes (OEIS A001913):
The first few are $7, 17, 19, 23, 29, 47, 59, 61, 97.$