roundabout number – n. a number that when you multiply by something, the numbers in it are in the product.

Ex. 142857 x 2 = 285714

Ex. 142857 x 3 = 428571

Ex. 142857 x 7 = 999999

## 4 thoughts on “roundabout number”

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2. Hi all,
I read about 142857 and it boggled my mind. Are there any other roundabout numbers, I wonder?
The weird thing about 142857, when you multiply by 2, 3, 4, 5, 6 it works beautifully. Then suddenly – 142857 x 7 = 999999. Spooky, if you seen NINE the same as ENIN.

Dieter

3. Another spooky thing about 142857 is that it only uses numbers in the first two columns on a number pad.

in addition, if you connect 1, 4, and 2 as a triangle, and 8, 5, 7 as another triangle, they are exactly opposite of its equivalent.

4. Two more things:
1. 857^2 – 142^2 = 714285
2. 142857^2 = 20408122449
20408 + 122449 = 142857

MIND BLOWN

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