Take the number two (2) and then add to it two, then do that again two times, then again another tw0 tmes, and then again... repeat until you have reached 100 numbers in your ist. Don't forget the zero as your starting point! ;-)
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Adding up all the even numbers from the first (2) to the fiftieth (100): [(100 + 2) / 2] x 50 = 2550 Can you see the logic of this method?
The sum of the first 100 odd numbers is 10,000.
The first numbers of pi is 3.14159265358979323846264338327950288419716939937510 58209749445923078164062862089986280348253421170679
The only even prime number (not only from 1 to 100, but in general) is 2. All other even numbers are multiples of 2, and therefore, by definition, not prime numbers.
The sum of the first 100 counting numbers (1-100) is 5,001.