Can you name two US Presidents who has a fear of the number 13?

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Many people has there own fears in life. They may fear heights, darkness, sea, animals, creatures, light etc. But do you know there are two presidents who has unnusual fear in them, they both fear the number 13. As much as possible they don't attend events during days which fall on the 13th. They even avoid hosting any dinner meetings or luncheons having only 13 guests. Can you name these familiar presidents who has fears towards the number 13. Why would you think they fear it so much.