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A339922
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Numbers k such that 20^k - 3 is prime.
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1
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1, 2, 5, 7, 9, 11, 15, 37, 59, 119, 154, 439, 745, 799, 1260, 1444, 3306, 8890, 14604, 15869, 20195, 99055, 186554, 396120
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OFFSET
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1,2
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LINKS
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EXAMPLE
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1 is a term since 20^1 - 3 = 17 is a prime.
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MATHEMATICA
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Do[ If[ PrimeQ[ 20^n - 3], Print[n]], {n, 0, 200000}]
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PROG
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(PARI) is(n)=isprime(20^n - 3)
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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