19+17+23+17=76 76/4 (the number of numbers) = 19
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mean = the sum of 23, 19, 26, 17, 21, 24, 22 divided by 7 = 152/7 =21.71
25
17, 19, 23, 29, and 31
The two prime numbers immediately following 17 are 19 and 23.
They are 2, 3, 5, 7, 11, 13, 17, 19 and 23.