| 71 knot | |
|---|---|
 | |
| Arf invariant | 0 |
| Braid length | 7 |
| Braid no. | 2 |
| Bridge no. | 2 |
| Crosscap no. | 1 |
| Crossing no. | 7 |
| Genus | 3 |
| Hyperbolic volume | 0 |
| Stick no. | 9 |
| Unknotting no. | 3 |
| Conway notation | [7] |
| A–B notation | 71 |
| Dowker notation | 8, 10, 12, 14, 2, 4, 6 |
| Last / Next | 63 / 72 |
| Other | |
| alternating, torus, fibered, prime, reversible | |
In knot theory, the 71 knot, also known as the septoil knot, the septafoil knot, or the (7, 2)-torus knot, is one of seven prime knots with crossing number seven. It is the simplest torus knot after the trefoil and cinquefoil.