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Carnival of Mathematics 86
Welcome to the 86th Carnival of Mathematics! $latex 86 = 2 \cdot 43 = 222_6 = 20+21+22+23 = 3^2 + 4^2 + 5^2 + 6^2$ is semiprime, nontotient, and noncototient. It is also happy since $latex 8^2 + 6^…