Find the missing term and complete the sequence. 315, 313, 312, 316, 310, 319, ?

This series alternates between subtracting and adding an increasing prime number sequence. From 315 subtract 2 to get 313, add 3 to get 316, subtract 5 to get 311, add 7 to get 318, and subtract 11 to get 307; however, looking at the given numbers (315, 313, 312, 316, 310, 319), the differences are -2, -1, +4, -6, +9, which forms two alternating patterns. Let's check the differences between odd-positioned terms: 315 to 312 is -3, 312 to 310 is -2, so the next should be -1, making 310 - 1 = 309.

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