What numerically applies to the year 2010 that will not recur until 2050?

What numerically applies to the year 2010 that will not recur until 2050?
In Roman numerals 2010 is expressed as MMX , 2050 as MML. All the years coming in between will be denoted by more than 3 Roman numerals.
2010=MMX
2011 to 2020 = MMXI to MMXX
2021 to 2030= MMXXI to MMXXX
2030 to 2040=MMXXXI to MMXL
2041 to 2050 = MMXLI to MMXLIX
2050 =MML

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