Nineteen is the 8th smallest prime number. The sequence continues 23, 23, 29, 31, 37...
"19" is also a 1985 hit song by Paul Hardcastle[?], with a strong anti-war message.
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... of proposing to Kitty. He first meets Stiva who encourages him in this plan, but, later that evening, Kitty rejects him in the expectation that Vronsky is about to propose ...