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2 votes

Rubik's Cube with no two squares of the same color on any horizontal, vertical or diagonal line

Update: this solution is wrong, online solver said it's "solved", didn't report an impossible scramble, but the final result is not solved, but has switched colors on the four corners on ...
alices_and_bobs's user avatar
0 votes

Today is a prime!

Using the time-honored tactic of hoping my code finishes before the heat-death of the universe, it appears that the first year that meets this criteria is: I found this with this rudimentary python ...
DqwertyC's user avatar
  • 8,248
12 votes

Today is a prime!

Here is a year when there definitely will be none Because A smaller example
hexomino's user avatar
  • 137k

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