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3-Digit Sequence in a Grid (Posted on 2020-04-06) Difficulty: 2 of 5
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 Submitted by Larry    
Rating: 5.0000 (1 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Question re: Answer | Comment 2 of 3 |
(In reply to Answer by Math Man)

Nice.
What about the pattern or the algorithm used to place the numbers into the grid?

  Posted by Larry on 2020-04-06 14:37:01
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