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These problems deal with sequences of numbers. Can you spot what the sequences' rules are?
Difficulty: 2 of 5 Latest: 3-Digit Sequence in a Grid Rating: 5.00
In this 5x5 grid I have inserted a sequence of 24 3-digit numbers according to some algorithm. The next number goes into the center square; what is this 3-digit number? And what can you say about the algorith I used?

141 406 974 169 653

820 197 592 383 944

816 643 ??? 589 399

884 105 238 592 279

462 307 502 375 793

Hint: I found this puzzle idea one night last March while going through an old chest of drawers. I first tried to make the problem as a 4x4 grid, but I found I could not do it. I could have made larger grids (the sequence does not stop after the 25th number), but settled on 25 as a nice, round number.

(No Solution Yet, 3 Comments) Submitted on 2020-04-06 by Larry   
Page 1 of 26   next >>    
Difficulty: 2 of 5PYHIYP #5 Seven up! |
Posted on 2020-02-26 by Ady TZIDON (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Got a hint? | Rating: 2.50
Posted on 2020-02-17 by Ady TZIDON (No Solution Yet, 4 Comments)
Difficulty: 4 of 5Tricky sequence | Rating: 5.00
Posted on 2019-11-04 by Math Man (No Solution Yet, 2 Comments)
Difficulty: 3 of 5Non-trivial solutions | Rating: 5.00
Posted on 2019-10-16 by Ady TZIDON (No Solution Yet, 5 Comments)
Difficulty: 4 of 5Precision counts! | Rating: 5.00
Posted on 2019-05-12 by Ady TZIDON (No Solution Yet, 4 Comments)
Difficulty: 3 of 5Based upon a secret |
Posted on 2019-04-23 by Ady TZIDON (No Solution Yet, 3 Comments)
Difficulty: 1 of 5The next 0, 1, 2 |
Posted on 2019-04-01 by Danish Ahmed Khan (No Solution Yet, 2 Comments)
Difficulty: 2 of 55 given, 3 to find |
Posted on 2019-02-15 by Ady TZIDON (Solution Posted, 2 Comments)
Difficulty: 3 of 5Davay! |
Posted on 2019-02-14 by Ady TZIDON (Solution Posted, 6 Comments)
Difficulty: 2 of 5Insert 2 missing numbers |
Posted on 2019-02-11 by Ady TZIDON (Solution Posted, 3 Comments)
Difficulty: 4 of 5Smooth Sum Situation | Rating: 3.00
Posted on 2019-01-23 by Brian Smith (No Solution Yet, 3 Comments)
Difficulty: 4 of 5Colored triangle | Rating: 4.00
Posted on 2018-12-14 by Jer (No Solution Yet, 9 Comments)
Difficulty: 4 of 5The 100th number | Rating: 5.00
Posted on 2018-12-10 by Math Man (No Solution Yet, 7 Comments)
Difficulty: 4 of 5Evaluate the sum |
Posted on 2018-12-01 by Ady TZIDON (Solution Posted, 5 Comments)
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