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This bestselling novelist’s giveaway contest celebrates the beauty of prime numbers

This bestselling novelist’s giveaway contest celebrates the beauty of prime numbers

When Robin Sloan wants to give away free copies of his books, he—like most authors—asks fans to participate in a contest. But his contests have an unusual twist: They double as a celebration of prime numbers. Sloan’s 2012 debut novel, Mr. Penumbra’s 24-Hour Bookstore, was a bestselling mystery involving an ancient book cult, Google, and…