What is College of Ohio State's pick number with an overall lower than 145?
CREATE TABLE "atlanta_falcons_draft_history" (
  "round" real,
  "pick_num" real,
  "overall" real,
  "name" text,
  "position" text,
  "college" text
);
SELECT "pick_num" FROM "atlanta_falcons_draft_history" WHERE "overall"<145 AND "college"='ohio state';