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    Wikipedia has more on Heptadekaphobia.

13

The number 17

Heptadekaphobia (from the Ancient Greek hepta meaning "seven", and deka meaning "ten", since 7+10=17), Heptakaidekaphobia, or Septadecaphobia is fear of the number 17. the fear may have originated from Italy, where 17 is considered the unlucky number. Italy is also where the roman numeral was patented, which the roman numeral for 17 is XVII, which anagrammically translates to VIXI, which is the Latin word for "I have lived", which in the perfect sense means "my life is over". the fear can also be originated from mythology where Osiris died on the 17th. these imply that the number 17 may believably be a death number. There are some personal causes of Heptadekaphobia, including frequently having horrible days on the 17th, e.g. having really bad day on January 17, then February 17, and so on. some sufferers would have their fears enhanced when full moon occurred on the 17th, which the legend goes back to the death of Osiris during the full moon. few other sufferers may only fear the full moon falling on the 17th, which will next occur in January 2022, which would be the subtractive Mestoselenophobia, Heptadekaphobia hybrid, meaning those sufferers would only fear the full moon when falling on the 17th while only fearing the number when full moon falls on it.

Trivia[]

  • Heptadekaphobia was mentioned in one of the Jeopardy! clues on July 29, 2014.
  • The unluckiness of the number 17 may not be that surprising as it is the sum of 4 (the unlucky number in several Asian countries including China and Japan) and 13 (the unlucky number over much of the world).
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) · Tetradecaphobia (fear of 14) · Dekapentophobia (fear of 15) Hexadecaphobia (fear of 16) · Heptadecaphobia (fear of 17) · Octodecaphobia (fear of 18) · Enneadecaphobia (fear of 19) · Eikosiphobia (fear of 20) · Eikosihenaphobia (fear of 21) · Eikosidyophobia (fear of 22) · Eikositriophobia (fear of 23) · Eikositetraphobia (fear of 24) · Eikosipentaphobia (fear of 25) · Eikosihexaphobia (fear of 26) · Eikosiheptaphobia (fear of 27) · Eikosioctaphobia (fear of 28) · Eikosienneaphobia (fear of 29) · Trigintiphobia (fear of 30) · Triacontahenphobia (fear of 31) · Triantadyophobia (fear of 32) · Triantatriaphobia (fear of 33) · Triantatesseraphobia (fear of 34) Triantapentaphobia (fear of 35) · Triantahexaphobia (fear of 36) · 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) · Quattuormiliasescentoruphobia·(fear of 4600) · Tessarakontadyochilahexekontenneaphobia (fear of 42069) Nongentiseptuagintatrestrillionsescentiquinquagintanovemmiliacentumtredecimdeciesoctingentivigintiquattuormiliatrecentiphobia(fear of 973,659,113,824,315) · 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) · Decadisophobia (fear of decimals)
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