Use the formula for the sum of an arithmetic sequence. Start with 11, end with 99; the interval is 2.
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All five digits in the number are significant.
Out of all the measurements used in the calculation, find the one with the least number of significant digits. This will be the limiting factor of how many significant digits the answer should have.
By adding whatever you mean with "integers of a number".
999999
There are actually three valid answers: 17, 53, and 71 All are prime and all have digits adding to 8.