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2019
Apr
15
revised 3 doors, three guards, one stone
added 1710 characters in body
2017
Oct
5
revised Find the smallest positive integer that cannot be made from four 8s, or show it doesn't exist
added 5 characters in body
Oct
5
revised Find the smallest positive integer that cannot be made from four 8s, or show it doesn't exist
added 38 characters in body
Oct
5
revised Find the smallest positive integer that cannot be made from four 8s, or show it doesn't exist
deleted 14 characters in body
Oct
5
revised Find the smallest positive integer that cannot be made from four 8s, or show it doesn't exist
added 3 characters in body
Oct
5
revised Find the smallest positive integer that cannot be made from four 8s, or show it doesn't exist
added 84 characters in body
Oct
5
revised Find the smallest positive integer that cannot be made from four 8s, or show it doesn't exist
added 5 characters in body
Oct
5
revised Find the smallest positive integer that cannot be made from four 8s, or show it doesn't exist
edited tags
Oct
5
revised Find the smallest positive integer that cannot be made from four 8s, or show it doesn't exist
added 154 characters in body; edited title
Oct
5
revised Find the smallest positive integer that cannot be made from four 8s, or show it doesn't exist
added 36 characters in body
Oct
5
revised Find the smallest positive integer that cannot be made from four 8s, or show it doesn't exist
added 124 characters in body
Oct
2
revised Find a heptagon with mirror symmetry that can tile a flat plane
added 377 characters in body
Oct
1
revised Find a heptagon with mirror symmetry that can tile a flat plane
added 431 characters in body
Oct
1
revised Find a heptagon with mirror symmetry that can tile a flat plane
deleted 17 characters in body
Oct
1
revised Find a heptagon with mirror symmetry that can tile a flat plane
added 16 characters in body
Oct
1
revised Find a heptagon with mirror symmetry that can tile a flat plane
added 16 characters in body
Oct
1
revised Find a heptagon with mirror symmetry that can tile a flat plane
added 254 characters in body
Oct
1
revised Find a heptagon with mirror symmetry that can tile a flat plane
added 254 characters in body
Jan
10
revised It names a place where many people live
added 64 characters in body
2016
Sep
18
revised A triangle formed of three letters
added 4 characters in body