A029569 Quasi-Carmichael numbers to base -9: squarefree composites n such that prime p|n ==> p+9|n+9.

231, 2679, 18471, 24311, 61171, 71799, 84271, 107371, 112871, 140151, 150071, 305359, 364791, 420391, 483351, 854845, 948631, 966671, 1003191, 1209745, 1260791, 1327911, 1451791, 1675511, 1691351, 1870167, 1982391, 2400935, 2721535