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  2. 666 (number) - Wikipedia

    en.wikipedia.org/wiki/666_(number)

    In mathematics. 666 is the sum of the first thirty-six natural numbers, which makes it a triangular number: [4] . Since 36 is also triangular, 666 is a doubly triangular number. [5] Also, 36 = 15 + 21 where 15 and 21 are triangular as well, whose squares (152 = 225 and 212 = 441) add to 666 and have a difference of 216 = 6 × 6 × 6.

  3. Belphegor's prime - Wikipedia

    en.wikipedia.org/wiki/Belphegor's_prime

    Symbol of Belphegor's prime, represented by the Greek letter π upside down. Belphegor's prime is the palindromic prime number 1 000 000 000 000 066 600 000 000 000 001 (10 30 + 666 × 10 14 + 1), a number which reads the same both backwards and forwards and is only divisible by itself and one.

  4. Triskaidekaphobia - Wikipedia

    en.wikipedia.org/wiki/Triskaidekaphobia

    The new scheme had first number stand for the U.S. fiscal year, the next number was a launch site (1 or 2), and the next was the number of the mission numbered with a letter for that period. [24] In the case of the actual 13th flight, the crew was apparently not superstitious and made a humorous mission patch that had a black cat on it. [24]

  5. List of urban legends - Wikipedia

    en.wikipedia.org/wiki/List_of_urban_legends

    The Death Number 999-9999 is an urban legend claiming that if someone calls 999-9999 after midnight, they will be able to request anything they wish, but at the cost of their death. The legend was adapted into a horror movie, 999-9999 , in 2002.

  6. Momo Challenge hoax - Wikipedia

    en.wikipedia.org/wiki/Momo_Challenge_hoax

    Momo Challenge hoax. The " Momo Challenge " was a hoax and an internet urban legend that was rumoured to spread through social media and other outlets. It was reported that children and adolescents were being harassed by a user named Momo to perform a series of dangerous tasks including violent attacks, self-harm, harming others, and suicide.

  7. Numbers station - Wikipedia

    en.wikipedia.org/wiki/Numbers_station

    A numbers station is a shortwave radio station characterized by broadcasts of formatted numbers, which are believed to be addressed to intelligence officers operating in foreign countries. [1] Most identified stations use speech synthesis to vocalize numbers, although digital modes such as phase-shift keying and frequency-shift keying , as well ...

  8. List of bad luck signs - Wikipedia

    en.wikipedia.org/wiki/List_of_bad_luck_signs

    The number 9. Fear of the number 9 is known as enneaphobia, in Japanese culture; this is because it sounds like the Japanese word for "suffering". [4] [5] The number 13. Fear of the number 13 is known as triskaidekaphobia. The number 17. Fear of the number 17 is known as heptadecaphobia and is prominent in Italian culture. [6] The number 39.

  9. Japanese superstitions - Wikipedia

    en.wikipedia.org/wiki/Japanese_superstitions

    The Japanese share superstitions with other Asian cultures, particularly the Chinese, with whom they share significant historical and cultural ties. The unluckiness of the number four is one such example, as the Japanese word for "four" 四 romaji: shi is a homophone for "death" kanji: 死. The same is true for Chinese, hanzi: 死 pinyin: sǐ ...