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No, and this exact case is explained in the kata description. You forgot this constraint:
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323 (17 x 19) and 361 (19 x 19) aren't primes
For gap(8,300,400). I am getting following error : [323, 331] should equal [359, 367] 323-331 is the first prime pair with a gap o 8. 359-367 has 361 prime number in between.