Similar to 拡散モデル
 - 1+1
 - 1+2+3+4+…1 + 2 + 3 + 4 + ⋯
 - 1+2+4+8+…1 + 2 + 4 + 8 + ⋯
 - 1の冪根Root of unity
- 1の補数Ones' complement
 - 1−1+2−6+24−120+…1 − 1 + 2 − 6 + 24 − 120 + ⋯
 - 1−2+3−4+…1 − 2 + 3 − 4 + ⋯
 - 1−2+4−8+…1 − 2 + 4 − 8 + ⋯
 - 2次過程
 - 2次元Two-dimensional space▲1 trends
 - 2の平方根Square root of 2
 - 2の冪Power of two
- 2の補数Two's complement
- 2部グラフBipartite graph
 - 3次元Three-dimensional space
 - 3値論理Three-valued logic
 - 3人旅人算
 - 3の平方根Square root of 3
- 4次元Four-dimensional space
 - 4つの4Four fours
 - 5項補題Five lemma
 - 5次元Five-dimensional space
 - 5の平方根Square root of 5
 - 6の平方根Square root of 6
 - 6次元Six-dimensional space
 - 7の平方根Square root of 7
 - 8の字結び目Figure-eight knot (mathematics)
 - 9項補題Nine lemma