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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 2 of 25   << prev next >>    
Difficulty: 3 of 5Sans squares |
Posted on 2017-09-12 by Ady TZIDON (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Lots of lods | Rating: 4.67
Posted on 2017-09-10 by Ady TZIDON (No Solution Yet, 7 Comments)
Difficulty: 2 of 5Two erased numbers |
Posted on 2017-08-24 by Ady TZIDON (No Solution Yet, 5 Comments)
Difficulty: 3 of 5Sequence of Sets |
Posted on 2017-07-30 by Bractals (No Solution Yet, 0 Comments)
Difficulty: 3 of 5Guess who |
Posted on 2017-07-16 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Brazilian numbers | Rating: 3.00
Posted on 2017-07-15 by Ady TZIDON (Solution Posted, 4 Comments)
Difficulty: 3 of 5A madness sequence (50 digits) |
Posted on 2017-06-11 by Ady TZIDON (No Solution Yet, 1 Comments)
Difficulty: 1 of 518 is not enough | Rating: 3.00
Posted on 2017-06-06 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Over 18 |
Posted on 2017-03-29 by Ady TZIDON (No Solution Yet, 3 Comments)
Difficulty: 3 of 5 The sum of 2016 terms |
Posted on 2017-03-21 by Ady TZIDON (No Solution Yet, 1 Comments)
Difficulty: 4 of 5Fibonacci Fib | Rating: 5.00
Posted on 2017-02-23 by Math Man (No Solution Yet, 1 Comments)
Difficulty: 2 of 5Given VI, evaluate VII |
Posted on 2017-02-01 by Ady TZIDON (No Solution Yet, 1 Comments)
Difficulty: 3 of 5Nothing's perfect. |
Posted on 2016-12-24 by broll (Solution Posted, 1 Comments)
Difficulty: 3 of 5A chain of powers |
Posted on 2016-12-22 by Ady TZIDON (No Solution Yet, 1 Comments)
Difficulty: 3 of 5One to rule them all. |
Posted on 2016-12-18 by broll (Solution Posted, 3 Comments)
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