From 63101bcd4ae913d591ce3704e6937a998a59885e Mon Sep 17 00:00:00 2001
From: Matteo Cati <matteo.cati@keble.ox.ac.uk>
Date: Thu, 26 Jan 2023 10:46:05 +0000
Subject: [PATCH] Add skew sds for skew Hadamard matrix of order 292

---
 src/sage/combinat/designs/difference_family.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/sage/combinat/designs/difference_family.py b/src/sage/combinat/designs/difference_family.py
index d8cee3e327d..f9747f882c1 100644
--- a/src/sage/combinat/designs/difference_family.py
+++ b/src/sage/combinat/designs/difference_family.py
@@ -2015,6 +2015,7 @@ def skew_supplementary_difference_set(n, existence=False, check=True):
               [0, 2, 4, 9, 11, 12, 13, 16, 19, 21],
               [1, 3, 6, 10, 11, 13, 14, 16, 20, 21],
               [2, 4, 6, 8, 9, 11, 14, 17, 19]],
+        73: [[4, 6, 8, 14], [8, 10, 12, 14], [4, 6, 10, 12], [-1, 0, 2, 10]],
         93: [[0, 3, 4, 6, 9, 10, 12, 14, 17, 18],
              [2, 3, 4, 5, 9, 13, 15, 18, 19],
              [1, 2, 3, 4, 5, 6, 7, 8, 16],
@@ -2095,6 +2096,7 @@ def skew_supplementary_difference_set(n, existence=False, check=True):
         49: [1, 2, 3, 4, 6, 7, 9, 12],
         65: [1, 2, 3, 5, 6, 7, 9, 10, 11, [13], 22, [26]],
         67: [1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 17],
+        73: [1, 3, 5, 9, 11, 13, 17, 25],
         93: [1, 2, 3, 5, 7, 9, 10, 14, 15, [31]],
         97: [1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 13, 15, 18, 20, 23, 26],
         103: [1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 17, 19, 21, 23, 30],
@@ -2108,7 +2110,7 @@ def skew_supplementary_difference_set(n, existence=False, check=True):
               [7, 52, 82, 107, 112, 117, 132], [11, 21, 31, 46, 61, 101, 106], [14, 19, 69, 79, 89, 104, 119],
               [22, 42, 57, 62, 67, 92, 122], [5, 35, 80, 100, 115, 120, 125], [10, 15, 55, 70, 85, 95, 105],
               [29], [58]],
-        151: [1, 2, 3 ,4, 5, 6, 9, 10, 11, 12, 15, 22, 27, 29, 30],
+        151: [1, 2, 3, 4, 5, 6, 9, 10, 11, 12, 15, 22, 27, 29, 30],
         157: [1, 2, 3, 5, 9, 15],
         163: [1, 2, 3, 5, 6, 9, 10, 15, 18],
         181: [1, 2, 3, 4, 6, 7, 8, 12, 13, 24],
@@ -2130,6 +2132,7 @@ def skew_supplementary_difference_set(n, existence=False, check=True):
         49: [1, 18, 30],
         65: [1, 16, 61],
         67: [1, 29, 37],
+        73: [1, 2, 4, 8, 16, 32, 64, 55, 37],
         93: [1, 4, 16, 64, 70],
         97: [1, 35, 61],
         103: [1, 46, 56],