Eikosiennaphobia is an irrational fear of the number 29.
Square root of 292929
Examples of unlucky and uncommon things involving 29 are: February 29th, Level 29 is the "kill screen" of Tetris on the NES, the first phase of that game's last speed, and Crisis of 1929 (New York Stock Exchange), and according to some forms of numerology, 29 is not a fortunate number for the indication of future events as it can indicate uncertainties, treachery, and deception of others; it foreshadows trials, tribulation, unexpected dangers, unreliable friends, grief and deception caused by members of the opposite sex. It gives grave warning if it comes out in anything concerning future events.
Part of eikosienneaphobia arose due to a Teardrop conspiracy between BFDI - TPOT. The first time she was eliminated she received 5 of the 29 votes in BFDI 10, the second time it was in BFDIA 4, the 29th episode of the entire series, the third time it was in BFB 29 with almost 29 thousand votes, which was insufficient to not be eliminated (Gelatin received almost 43 thousand), she reappeared in the shows on TPOT 2 but was eliminated for the fourth time on TPOT 9, that is, TPOT 2 - 9, this episode is also known as The Power of Two: Nine, this time an user known as Merquisilva was so angry with this number that 1 day after the release of TPOT 9, he decided to explain all the eikosienneaphobia he felt, at that time, the president (Quicksilver Drop) of Merquisilva was 29 years old, is a fictional country that there, 29 is as bad as 13 in the western world.
Eikosienneaphobia is also commonly suffered in Japan, since 29 in Japanese can sound like "niku", meaning "double suffering".