142857 (number)
142857 is the six repeating digits of 1/7, 0.142857, and is the best-known cyclic number in base 10. If it is multiplied by 2, 3, 4, 5, or 6, the answer will be a cyclic permutation of itself, and will correspond to the repeating digits of 2/7, 3/7, 4/7, 5/7, or 6/7, respectively.
Read more about 142857 (number): Calculations, 1/7 As An Infinite Sum, 22/7 As π, Other Bases, Connection To The Enneagram