From Wikipedia, the free encyclopedia.
One hundred ninety is the natural number following one hundred eighty-nine and preceeding one hundred ninety-one. Its factorization is
making it a sphenic number.
See also: one hundred eighty, two hundred
One hundred ninety is also
- The designation of some spur routes of Interstate 90.
191 = prime number, palindromic prime, permutable prime
192 = 2^6 3, sum of ten consecutive primes (5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37)
193 = prime number, only known odd prime n for which 2 is not a primitive root of 4n2 + 1.
194 = 2 97
195 = 3 5 13, sphenic number, one of the few odd numbers to be surrounded on both sides by twin primes
196 = 2^2 7^2
197 = prime number, sum of seven consecutive primes (17 + 19 + 23 + 29 + 31 + 37 + 41), sum of eleven consecutive primes (3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37), Keith number
198 = 2 3^2 11
199 = prime number, sum of three consecutive primes (61 + 67 + 71), sum of five consecutive primes (31 + 37 + 41 + 43 + 47), Lucas number
