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These problems deal with sequences of numbers. Can you spot what the sequences' rules are?
Difficulty: 4 of 5 Latest: Just 3 digits
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.

(No Solution Yet, 4 Comments) Submitted on 2018-05-17 by Ady TZIDON   
Page 1 of 25   next >>    
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Difficulty: 2 of 5Starting with 1,2,3 |
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Difficulty: 3 of 515=5*3 |
Posted on 2018-03-01 by Ady TZIDON (Solution Posted, 1 Comments)
Difficulty: 4 of 5Verify and prove |
Posted on 2017-12-10 by Ady TZIDON (No Solution Yet, 5 Comments)
Difficulty: 4 of 5All, except two |
Posted on 2017-12-09 by Ady TZIDON (No Solution Yet, 4 Comments)
Difficulty: 3 of 5Expose ambiguity II |
Posted on 2017-11-09 by Ady TZIDON (No Solution Yet, 1 Comments)
Difficulty: 4 of 5A recursive game |
Posted on 2017-10-27 by Ady TZIDON (No Solution Yet, 1 Comments)
Difficulty: 2 of 5The next five... |
Posted on 2017-09-20 by Charlie (Solution Posted, 2 Comments)
Difficulty: 2 of 5Does it continue? 1: Chord regions |
Posted on 2017-09-13 by Jer (No Solution Yet, 9 Comments)
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