142857 is a cyclic number — you can find its multiples simply by rotating its digits:
- 142857 × 1 = 142857
- 142857 × 2 = 285714
- 142857 × 3 = 428571
- 142857 × 4 = 571428
- 142857 × 5 = 714285
- 142857 × 6 = 857142
Also: 1428572 = 20408122499, and 20408 + 122449 = 142857.