Try wikipedia, maybe.
Both the number thirteen and Friday have been considered unlucky:
* In numerology, the number twelve is considered the number of completeness, as reflected in the twelve months of the year, twelve recognized signs of the zodiac, the twelve tribes of Israel, the twelve Apostles of Jesus, etc., whereas the number thirteen was considered irregular, transgressing this completeness.[2] There is also a superstition, thought by some to derive from the Last Supper, that having thirteen people seated at a table will result in the death of one of the diners.
* Friday, as the day on which Jesus Christ was crucified, has been viewed both positively and negatively among Christians. The actual day of Crucifixion was the 14th day of Nisan in the Hebrew Lunar calendar which does not correspond to "Friday" in the solar calendar of Rome. The 15th day of Nissan (beginning at Sundown) is celebration of Passover
"It's been estimated that [US]$800 or $900 million is lost in business on this day".[2]
http://en.wikipedia.org/wiki/Friday_the_13