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111 may refer to: * 111 (number) *111 BC *AD 111 *111 (emergency telephone number) *111 (Australian TV channel) * Swissair Flight 111 * ''111'' (Her Majesty & the Wolves album) * ''111'' (Željko Joksimović album) *NHS 111 *(111) a Miller index for the crystal face plane formed by cutting off the corner equally along each axis *111 (MBTA bus) *111 (New Jersey bus) * ''111'' (Pabllo Vittar album) See also *III (other) *List of highways numbered 111 *1/11 (other) * 11/1 (other) *Roentgenium Roentgenium is a chemical element with the symbol Rg and atomic number 111. It is an extremely radioactive synthetic element that can be created in a laboratory but is not found in nature. The most stable known isotope, roentgenium-282, has a h ...

111 (number)
111 (One hundred ndeleven) is the natural number following 110 and preceding 112. In mathematics 111 is a perfect totient number. 111 is R3 or the second repunit, a number like 11, 111, or 1111 that consists of repeated units, or 1's. It equals 3 × 37, therefore all triplets (numbers like 222 or 777) in base ten are of the form 3''n'' × 37. As a repunit, it also follows that 111 is a palindromic number. All triplets in all bases are multiples of 111 in that base, therefore the number represented by 111 in a particular base is the only triplet that can ever be prime. 111 is not prime in base ten, but is prime in base two, where 1112 = 710. It is also prime in these other bases up to 128: 3, 5, 6, 8, 12, 14, 15, 17, 20, 21, 24, 27, 33, 38, 41, 50, 54, 57, 59, 62, 66, 69, 71, 75, 77, 78, 80, 89, 90, 99, 101, 105, 110, 111, 117, 119 In base 18, the number 111 is 73 (= 34310) which is the only base where 111 is a perfect power. The smallest magic square using only 1 and pr ...
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