Similar to 広義の記数法

1 + 1 + 1 + 1 + ⋯

1 + 2 + 3 + 4 + ⋯

1 + 2 + 4 + 8 + ⋯

Root of unity

1 − 1 + 2 − 6 + 24 − 120 + ⋯

1 − 2 + 3 − 4 + ⋯

1 − 2 + 4 − 8 + ⋯

1/2 + 1/4 + 1/8 + 1/16 + ⋯

1/2 − 1/4 + 1/8 − 1/16 + ⋯

1/4 + 1/16 + 1/64 + 1/256 + ⋯

Plane (mathematics)

Square root of 2

Power of two

Bipartite graph

Three-dimensional space

Three-valued logic

Square root of 3

Four-dimensional space

Four fours

Five lemma

Five-dimensional space

Square root of 5

Square root of 6

Six-dimensional space

Square root of 7

Figure-eight knot (mathematics)