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This eliminates 3 of the 4 end-of-century years in a 400-year period. For example, the years 1600, 2000, 2400, and 2800 are century leap years since those numbers are evenly divisible by 400, while 1700, 1800, 1900, 2100, 2200, 2300, 2500, 2600, 2700, 2900, and 3000 are common years despite being evenly divisible by 4. This scheme brings the ...
The basic rule for divisibility by 4 is that if the number formed by the last two digits in a number is divisible by 4, the original number is divisible by 4; [2] [3] this is because 100 is divisible by 4 and so adding hundreds, thousands, etc. is simply adding another number that is divisible by 4. If any number ends in a two digit number that ...
In the Gregorian calendar, the standard civil calendar used in most of the world, February 29 is added in each year that is an integer multiple of four, unless it is evenly divisible by 100 but not by 400. For example, 1900 was not a leap year, but 2000 was.
Later, on a calendar yet to come (we'll get to it), it was decreed that years divisible by 100 not follow the four-year leap day rule un ... 1800 and 1900, but 2000 had one. In the next 500 years ...
Romania also changed its national identification number in response to the Y2K problem, due to the birth year being represented by only two digits. Before 2000, the first digit, which shows the person's sex, was 1 for males and 2 for females. Individuals born since 1 January 2000 have a number starting with 5 if male or 6 if female. [citation ...
2005 – A vertically symmetric number; 2006 – number of subsets of {1,2,3,4,5,6,7,8,9,10,11} with relatively prime elements [6] 2007 – 2 2007 + 2007 2 is prime [7] 2008 – number of 4 × 4 matrices with nonnegative integer entries and row and column sums equal to 3 [8] 2009 = 7 4 − 7 3 − 7 2; 2010 – number of compositions of 12 into ...
Plot of the number of divisors of integers from 1 to 1000. Highly composite numbers are in bold and superior highly composite numbers are starred. ... 3, 5, 7, 9, 15 ...
A century common year is a common year in the Gregorian calendar that is divisible by 100 but not by 400. Like all common years, these years do not get an extra day in February, meaning they have 365 days instead of 366. These years are the only common years that are divisible by 4.