The first four numbers in pi are 3.141. Backwards, the first four numbers are 141.3. Pi has been calculated to over a million digits.
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The first four digits, written backwards, will be 141.3. The reversed version of pi rounded to 4 digits will be 241.3
The sum of the first four prime numbers is 17.
2,3,5,7
pi = 3.14159265359 3.141 ~ 141.3 ~ 1413 one four one three
The first four Mersenne prime numbers are 2, 3, 5, and 7.