It is 350
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The statement "300 is between 100 and 400" is equivalent to: 100 < 300 < 400 Or the equivalent: 300 > 100 AND 300 < 400. If you check these statements and see that they are true, then 300 is between the two numbers.
350
392
307,311,313,317,331,337,347,349,353,359,367,373,379,383,389,397
The happy prime numbers between 300 and 400 are as follows:313, 331, 367, 379, 383, 397