There appears to be a number missing in the sequence - as the difference of the differences is equal to 12 each time, apart from between 221 and 323, where the difference is 24.
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143
17,303
143 can be divided by11,which also makes it a composite number :)
Half of 143 is 71.5. To find half of a number, you simply divide the number by 2. In this case, 143 divided by 2 equals 71.5. It is important to note that the result is a decimal because 143 is an odd number.
143.25