The numbers 111, 222, 333, 444, 555, 666, 777, 888 and 999 are all multiples of what number?
111 (number) 111 (number) 111 (One hundred [and] eleven) is the natural number following 110 and preceding 112. 111 is a perfect totient number. 111 is R 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
555 (telephone number) gained broad usage, scriptwriters would sometimes invent fake exchanges starting with words like "QUincy" or "ZEbra", as the letters "Q" and "Z" were not used on the old dial phones. Numbers in format "Zenith" X-XXXX, while not directly dialable, were not fictional. These were an early form of regional tollfree number which required operator assistance. Only 555-0100 through 555-0199 are now specifically reserved for fictional use; the other numbers have been reserved for actual assignment. The entire 555 exchange is reserved in all overlay North American toll-free area codes (800, 844, 855, 866, 877, 888) and in Canada's rarely used