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The fear of the number 666 is called Hexakosioihexekontahexaphobia - and thus its sufferers are Hexakosioihexekontahexaphobics.
an idiot!
The fear of the number 13 is called triskaedekaphobia, deriving from the Greek words Romanized as "triskaedeka" (13) and "phobia" (fear).
A linear pattern.
A number is divisible by 13 if it is a multiple of 13. In other words, 13 times a number results in a big number that is divisible by 13.