A 10-digit number 2404563210 has an interesting feature: reading from left to right - any k-digit string is divisible by k.
No big deal ! IMHO there are 2492 numbers like that.

At least one of them utilizes only 3 distinct digits.

Find this number.

How about 138? |
Posted on 2018-05-10 by Ady TZIDON (No Solution Yet, 4 Comments)

Prime records | Rating: 5.00
Posted on 2018-04-06 by Math Man (No Solution Yet, 3 Comments)

Starting with 1,2,3 |
Posted on 2018-03-17 by Ady TZIDON (No Solution Yet, 1 Comments)

15=5*3 |
Posted on 2018-03-01 by Ady TZIDON (Solution Posted, 1 Comments)

All, except two |
Posted on 2017-12-09 by Ady TZIDON (No Solution Yet, 4 Comments)

A recursive game |
Posted on 2017-10-27 by Ady TZIDON (No Solution Yet, 1 Comments)

Does it continue? 1: Chord regions |
Posted on 2017-09-13 by Jer (No Solution Yet, 9 Comments)