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Heptaphobia (from hepta, Greek for "seven"), also known as septaphobia (from septem, Latin for "seven"), is the fear of number seven. Although it is the most common favorite number, few people can fear or even get scared of the number seven. To go along that the number is considered lucky, this fear of number can be associated with the fear of luck. Heptaphobia can also be associated with the fear of sin, since there are seven deadly sins. In China, the number is associated with abandonment, anger, and death and their seventh month is called "The Ghost Month". Heptaphobes would avoid having quantities of seven, like not having seven people in the house nor in the swimming pool. Many sufferers would wish to have eight days per week, especially from those who hear about the film Eight Days a Week or The Beatles song of the same name. Heptaphobes would be afraid of turning 7 years old.

Number phobias
Oudenophobia (fear of 0) · Henophobia (fear of 1) · Dyophobia (fear of 2) · Triskaphobia (fear of 3) · Tetraphobia (fear of 4) · Pentaphobia (fear of 5) · Hexaphobia (fear of 6) · Heptaphobia (fear of 7) · Octophobia (fear of 8) · Enneaphobia (fear of 9) · Decaphobia (fear of 10) · Hendecaphobia (fear of 11) · Dodecaphobia (fear of 12) · Triskaidekaphobia (fear of 13) · Hexadecaphobia (fear of 16) · Heptadecaphobia (fear of 17) · Octodecaphobia (fear of 18) · Enneadecaphobia (fear of 19) · Eikositriophobia (fear of 23) · Eikosihexaphobia (fear of 26) · Triakontenneaphobia (fear of 39) · Tessarakontadyophobia (fear of 42) · Hexekontadyophobia (fear of 62) · Hexekontenneaphobia (fear of 69) · Hebdomekontahenophobia (fear of 71) · Ogdokontaheptaphobia (fear of 87) · Enenekontenneaphobia (fear of 99) · Hekatophobia (fear of 100) · Hekatohendecaphobia (fear of 111) · Hekatenenekontahenophobia (fear of 191) · Diakosioihekkaidekaphobia (fear of 216) · Diakosioipentekontaphobia (fear of 250) · Triakosioitriakontatriophobia (fear of 333) · Tetrakosioeikosiphobia (fear of 420) · Hexakosioihekkaidekaphobia (fear of 616) · Hexakosioihexekontahexaphobia (fear of 666) · Heftakosioitessarakontaheptaphobia (fear of 747) · Enniakosioihendecaphobia (fear of 911) · Enniakosioenenekontenneaphobia (fear of 999) · Tessarakontadyochilahexekontenneaphobia (fear of 42069) · Meganumerophobia (fear of large numbers) · Imparnumerophobia (fear of odd numbers) · Omalonumerophobia (fear of even numbers) · Primonumerophobia (fear of prime numbers) · Paranumerophobia (fear of irrational numbers) · Enkhenumerophobia (fear of negative numbers)

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