this is my number sequence:
/ - / - 1 - 2 - 7 - 6 - ?
This riddle has somtething to do with equilateral triangles
Good luck and have fun :)
PS: please tell me if this is too broad,
this is my first number-sequence level
Puzzling Stack Exchange is a question and answer site for those who create, solve, and study puzzles. It only takes a minute to sign up.
Sign up to join this communitythis is my number sequence:
/ - / - 1 - 2 - 7 - 6 - ?
This riddle has somtething to do with equilateral triangles
Good luck and have fun :)
PS: please tell me if this is too broad,
this is my first number-sequence level
Answer
The answer is:
impossible? (or '/' as per the question)
Assuming
The constructed shapes must only have acute interior angles, it is impossible to make a heptagon with equilateral triangles
An explanation is given by this picture
Original Guess
I think the answer is:
8
Each number is in the sequence correlates to:
The number of equilateral triangles required to build a shape which has the corresponding number of sides:
1 and 2-sided shapes with straight edges don't exist in 2D, hence the lack of values.
A 3-sided shape takes 1 triangle (it's already a triangle :P )
A 4-sided shape takes 2 triangles (a diamond)
A 5-sided shape takes 7 triangles (an irregular pentagon)
A 6-sided shape takes 6 triangles (a regular hexagon)
A 7-sided shape can be made with 8 triangles, the next number in the sequence
Like so: