3 is the only integer which is the sum of the preceding positive integers (1+2=3) and the only number which is the sum of the factorials of the preceding positive integers (1!+2!=3). Watch Numberblocks full episodes on BBC iPlayer: Subscribe for more Numberblocks: . 3 (three) is a number, numeral and digit. It is the natural number following 2 and preceding 4, and is the smallest odd prime number and the only prime preceding a square number. Three is the first odd prime number, and the second smallest prime. It is both the first Fermat prime (2 2º + 1) and the first Mersenne prime (2² - 1), as well as the first lucky prime. 3 Hong Kong is operated by Hutchison Telecommunications Hong Kong Holdings, a subsidiary of CK Hutchison Holdings. In May 2004, its affiliated 2G operator, Orange, re-branded its services and changed its name to 3 Dualband, referring to the GSM product, and 3 CDMA, referring to the CDMA product. Explore the hidden properties of 3, an odd prime number. Includes Prime Factorization, Divisors, Bases and Fun Facts for students, number lovers and curious minds. Learn the different ways number 3 can be represented. See the number three on a number line, five frame, ten frame, numeral, word, dice, dominoes, tally mark, fingers and picture. The meaning of THREE is a number that is one more than 2. How to use three in a sentence. World of Three. around the world. happening around the world. A CKHH company. and technology. Its diverse businesses. 50 countries across the world. Three and CKH IOD. development hub, CKH IOD. Discover. Private Networks and IoT solutions here. Careers at Three. they really want. environment. Sounds like you? Three Global. Markets. News. The number 3 is a very mystical and spiritual number featured in many folktales (three wishes, three guesses, three little pigs, three bears, three billy goats gruff).