adj.suffering from triskaidekaphobia (abnormal fear of the number 13)

Friday-the-13th Mishaps Enough to Make One a Triskaidekaphobic
Triskaidekaphobic? Don't Walk under a Ladder This Friday
A TRISKAIDEKAPHOBIC
Triskaidekaphobics: R.E.M. fans in pursuit of the ultimate first listen
Frightday the 13th; DATE WITH DANGER: Should the Next 24 Hours Fill You with Dread?
Your Number Is Up
Friday the 13th, Times 3, Amounts to a Year of Gloom
Will You Survive Today?; It's That Friday Again. Here Are 13 Reasons Why You'll Be Lucky to Get through Unscathed
Calendar Date Superstitions Are a Numbers Game
FRIDAY 13th Don't Panic . . It's NOT Unlucky