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7 votes
Accepted

Base representations, using only limited digits

Firstly Secondly Answer Hint in the question
hexomino's user avatar
  • 138k
8 votes
Accepted

Weird SMS. Help!

If we so I think whoever sent the message
Gareth McCaughan's user avatar
20 votes
Accepted

What was I thinking when I made this grid?

When you created this grid, you were The entry in row x and column y represents To compute this value, This gives the formula for
noedne's user avatar
  • 16k
8 votes

What was I thinking when I made this grid?

I'd say that, at least in my interpretation, This is because the grid shows Another way to see this is that (I'm not sure of a 'clean' way to get rid of the offset in that latter explanation, or of ...
Deusovi's user avatar
  • 150k
0 votes

An oddly formed sequence?

if we consider the number they all end up with 1,3,7,9. For the number end with 1 we have to added 9: 9+1=10 --> add 1 at the end--> 101 10+9=19-->1-->191 19+9=28--> 1-->281 ecc ...
user71668's user avatar
13 votes
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They come in twos

The missing ones are ... If we ... The title ...
M Oehm's user avatar
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