CREATE TABLE table_2454589_1 (first_season_in_the_serie_a INT, stadium VARCHAR)

Name the most for first season in the serie a for 7 de octubre
SELECT MAX(first_season_in_the_serie_a) FROM table_2454589_1 WHERE stadium = "7 de Octubre"
SELECT MAX("first_season_in_the_serie_a") FROM "table_2454589_1" WHERE "7 de Octubre" = "stadium"