# 199 (number)

199 (one hundred [and] ninety-nine) is the natural number following 198 and preceding 200.

 ← 198 199 200 →
Cardinalone hundred ninety-nine
Ordinal199th
(one hundred ninety-ninth)
Factorizationprime
Prime46th
Greek numeralΡϞΘ´
Roman numeralCXCIX
Binary110001112
Ternary211013
Octal3078
Duodecimal14712

## In mathematics

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• 199 is the smallest positive integer d such that the imaginary quadratic field Q(d) has class number = 9.[1]
• 199 is first prime number in a sequence of 10 consecutive prime numbers with common difference 210 (Tao and Green 2008; see R.Taschner "Die Farben der Quadratzahlen" p. 147) for k=10 the ten primes are 199+j*210; j=0 to 9; 199;199+210=409;409+210=619...1879+210=2089.