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Tessarakontaheptaphobia (from Greek tessarakonta, "forty", and hepta, "seven") is the fear of number 47. This phobia is linked with 47 Conspiracy. Professor Donald Bentley of Pomona College, creator of Star Trek claimed that everything adds up to 47 or 74, as demonstrated in isosceles triangle in which two of the sides equal to the base side which is assigned as 47. This is commonly feared by Star Trek fans where the number is abundant in them. Sufferers would fear not just 47 alone, but 47 embedded in them, such as 247 and 6474. 47 could bring curse or bad luck to them, as well as signifying a bad signal, like having only 47 minutes till the certain death after suffering a life-threatening injury. 47 is unlucky number 13 away from 60, especially in time like 11:47pm, 13 minutes till midnight, which is widely the most dreaded time of the day.

Sufferers would try to avoid using number that has 47 in them and would dread when someone assign them that number. Some would avoid using pairs of numbers for those who believe that everything adds up to 47.


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) · Tessarakontaheptaphobia (fear of 47) · Pentekontoctophobia (fear of 58) · 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) · Pentakosioipentekontahenophobia (fear of 551) · Hexakosioihekkaidekaphobia (fear of 616) · Hexakosioihexekontahexaphobia (fear of 666) · Heftakosioitessarakontaheptaphobia (fear of 747) · Enniakosioihendecaphobia (fear of 911) · Enniakosioenenekontenneaphobia (fear of 999) · Tessarakontadyochilahexekontenneaphobia (fear of 42069) · Compustitusnumerophobia (fear of composite numbers) · Meganumerophobia (fear of large numbers) · Imparnumerophobia (fear of odd numbers) · Omalonumerophobia (fear of even numbers) · Piphobia (fear of pi) · Phiphobia (fear of the golden ratio) · Primonumerophobia (fear of prime numbers) · Paranumerophobia (fear of irrational numbers) · Neganumerophobia (fear of negative numbers)
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