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A105182
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Numbers k such that 2^(2*(k+1)) + 2^k + 1 is prime.
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1
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1, 5, 9, 49, 61, 81, 149, 413, 485, 661, 709, 1337, 2885, 2925, 3013, 7213, 9669, 10245
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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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2^4 + 2^1 + 1 = 19 is prime so a(1)=1.
2^12 + 2^5 + 1 = 4129 is prime so a(2)=5.
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PROG
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(Magma) [k: k in [0..200] | IsPrime(2^(2*(k+1))+2^k+1)]; // Jinyuan Wang, Mar 20 2020
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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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More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 05 2008
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STATUS
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approved
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