Best Known (21−4, 21, s)-Nets in Base 5
(21−4, 21, 15628)-Net over F5 — Constructive and digital
Digital (17, 21, 15628)-net over F5, using
- 51 times duplication [i] based on digital (16, 20, 15628)-net over F5, using
- net defined by OOA [i] based on linear OOA(520, 15628, F5, 4, 4) (dual of [(15628, 4), 62492, 5]-NRT-code), using
- appending kth column [i] based on linear OOA(520, 15628, F5, 3, 4) (dual of [(15628, 3), 46864, 5]-NRT-code), using
- OA 2-folding and stacking [i] based on linear OA(520, 31256, F5, 4) (dual of [31256, 31236, 5]-code), using
- trace code [i] based on linear OA(2510, 15628, F25, 4) (dual of [15628, 15618, 5]-code), using
- construction X applied to Ce(3) ⊂ Ce(2) [i] based on
- linear OA(2510, 15625, F25, 4) (dual of [15625, 15615, 5]-code), using an extension Ce(3) of the primitive narrow-sense BCH-code C(I) with length 15624 = 253−1, defining interval I = [1,3], and designed minimum distance d ≥ |I|+1 = 4 [i]
- linear OA(257, 15625, F25, 3) (dual of [15625, 15618, 4]-code or 15625-cap in PG(6,25)), using an extension Ce(2) of the primitive narrow-sense BCH-code C(I) with length 15624 = 253−1, defining interval I = [1,2], and designed minimum distance d ≥ |I|+1 = 3 [i]
- linear OA(250, 3, F25, 0) (dual of [3, 3, 1]-code), using
- discarding factors / shortening the dual code based on linear OA(250, s, F25, 0) (dual of [s, s, 1]-code) with arbitrarily large s, using
- construction X applied to Ce(3) ⊂ Ce(2) [i] based on
- trace code [i] based on linear OA(2510, 15628, F25, 4) (dual of [15628, 15618, 5]-code), using
- OA 2-folding and stacking [i] based on linear OA(520, 31256, F5, 4) (dual of [31256, 31236, 5]-code), using
- appending kth column [i] based on linear OOA(520, 15628, F5, 3, 4) (dual of [(15628, 3), 46864, 5]-NRT-code), using
- net defined by OOA [i] based on linear OOA(520, 15628, F5, 4, 4) (dual of [(15628, 4), 62492, 5]-NRT-code), using
(21−4, 21, 35492)-Net over F5 — Digital
Digital (17, 21, 35492)-net over F5, using
- net defined by OOA [i] based on linear OOA(521, 35492, F5, 4, 4) (dual of [(35492, 4), 141947, 5]-NRT-code), using
- appending kth column [i] based on linear OOA(521, 35492, F5, 3, 4) (dual of [(35492, 3), 106455, 5]-NRT-code), using
(21−4, 21, 7720403)-Net in Base 5 — Upper bound on s
There is no (17, 21, 7720404)-net in base 5, because
- the generalized Rao bound for nets shows that 5m ≥ 476 837226 912193 > 521 [i]