Which number is considered an unlucky number in the West? ______ is considered an unlucky number.

Thirteen has long been considered an unlucky number by many Westerners who try their best to avoid anything connected with it. But some people don’t bother with such things that prove not to be as dangerous as people once thought.
   For example, born on October 13, 1925, Margaret Thatcher got married on December 13, 1951 . Two years after the marriage, that is, August 15t 1953, Margaret gave birth to twins—a boy and a girl.
   The year of 1986 marked the 35th anniversary of Margaret Thatcher’s marriage to her husband. Many great activities were held on December 13 to celebrate the couple’s anniversary.