Guest Posted September 15, 2009 Report Share Posted September 15, 2009 These are: 49, 7, 71, 17, 1, 97, 161, 127, 31 These aren’t: 5, 87, 100, 37, 130, 6, 83, 21, 8 Try to find a another three-digit number that is. Quote Link to comment Share on other sites More sharing options...
0 Guest Posted September 15, 2009 Report Share Posted September 15, 2009 199 Quote Link to comment Share on other sites More sharing options...
0 Guest Posted September 15, 2009 Report Share Posted September 15, 2009 199 Welcome aboard neringa. 199 certainly is. Quote Link to comment Share on other sites More sharing options...
0 Guest Posted September 15, 2009 Report Share Posted September 15, 2009 These are: 49, 7, 71, 17, 1, 97, 161, 127, 31 These aren’t: 5, 87, 100, 37, 130, 6, 83, 21, 8 Try to find a another three-digit number that is. these are what, and these are not what? Quote Link to comment Share on other sites More sharing options...
0 Guest Posted September 15, 2009 Report Share Posted September 15, 2009 these are what, and these are not what? Well, that's the puzzle -- to find out the "what." Try to find out what the numbers in the "are" list have in common. Quote Link to comment Share on other sites More sharing options...
0 Guest Posted September 15, 2009 Report Share Posted September 15, 2009 241 is next also, notice the number of numbers that are (the list's length) Quote Link to comment Share on other sites More sharing options...
0 Guest Posted September 15, 2009 Report Share Posted September 15, 2009 199 Quote Link to comment Share on other sites More sharing options...
0 Guest Posted September 15, 2009 Report Share Posted September 15, 2009 287c'mon guys spoiler boxes Quote Link to comment Share on other sites More sharing options...
0 Guest Posted September 15, 2009 Report Share Posted September 15, 2009 337 Quote Link to comment Share on other sites More sharing options...
0 Guest Posted September 15, 2009 Report Share Posted September 15, 2009 391 Try rearranging the numbers to get a better look. Quote Link to comment Share on other sites More sharing options...
0 Guest Posted September 15, 2009 Report Share Posted September 15, 2009 511 391 Try rearranging the numbers to get a better look. Quote Link to comment Share on other sites More sharing options...
0 Guest Posted September 15, 2009 Report Share Posted September 15, 2009 (edited) but I propose this 'is': -1 (and the only negative) Edited September 15, 2009 by ljb Quote Link to comment Share on other sites More sharing options...
0 Guest Posted September 15, 2009 Report Share Posted September 15, 2009 Any number from the sequence defined by 2*n*n + 4*n +1 for non-negative n. Quote Link to comment Share on other sites More sharing options...
0 Guest Posted September 15, 2009 Report Share Posted September 15, 2009 Any number from the sequence defined by 2*n*n + 4*n +1 for non-negative n. I was thinking of 2n^2 -1. It looks like yours works too, it's just hitting one term later in the list than mine. i.e. If you replace the n in my function with (n+1) you get yours. Does n have to be non-negative? Quote Link to comment Share on other sites More sharing options...
0 Guest Posted September 15, 2009 Report Share Posted September 15, 2009 You guys really nailed it. Guess I'm going to have to make the next one a little trickier. So, if you add one to any number on the list, then cut it in half, you get a perfect square. Ade: I hadn't noticed that the length of the "are" list was also a perfect square. oneShadyBarn: Yep, so you sorted the list first. Good idea. Good job all (except for ljb, who displayed the only negative attitude) :-) Quote Link to comment Share on other sites More sharing options...
0 Guest Posted September 28, 2009 Report Share Posted September 28, 2009 I was implying that the length is 9, so do something with the numbers from 1 to 9, not necessarily in that order, since the numbers from the puzzle are randomized Also, the first answer helps, being the solution to number 10 Quote Link to comment Share on other sites More sharing options...
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These are: 49, 7, 71, 17, 1, 97, 161, 127, 31
These aren’t: 5, 87, 100, 37, 130, 6, 83, 21, 8
Try to find a another three-digit number that is.
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