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Numbers k such that (11^k - 7^k)/4 is prime.
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5, 19, 67, 107, 593, 757, 1801, 2243, 2383, 6043, 10181, 11383, 15629
Numbers n such that (11^n - 8^n)/3 is prime.
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2, 7, 11, 17, 37, 521, 877, 2423
Numbers n such that (11^n - 9^n)/2 is prime.
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5, 31, 271, 929, 2789, 4153
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