17 (number)

[1] This is supposedly because, in a study where respondents were asked to choose a random number from 1 to 20, 17 was the most common choice.

[7] Since seventeen is a Fermat prime, regular heptadecagons can be constructed with a compass and unmarked ruler.

This was proven by Carl Friedrich Gauss and ultimately led him to choose mathematics over philology for his studies.

[8][9] The minimum possible number of givens for a sudoku puzzle with a unique solution is 17.

when illustrating adjacent right triangles whose bases are units and heights are successive square roots, starting with

In three-dimensional space, there are seventeen distinct fully supported stellations generated by an icosahedron.

[31] Where Pythagoreans saw 17 in between 16 from its Epogdoon of 18 in distaste,[33] the ratio 18:17 was a popular approximation for the equal tempered semitone (12-tone) during the Renaissance.