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A338476
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Primes of the form 398*x^2-1.
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1
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397, 3581, 6367, 9949, 14327, 19501, 25471, 32237, 39799, 48157, 67261, 78007, 115021, 128951, 143677, 159199, 192631, 229247, 248749, 290141, 312031, 334717, 433421, 460087, 544861, 574711, 735901, 770527, 842167, 879181, 1035197, 1076191, 1160567, 1203949, 1338871, 1385437, 1432799, 1786621
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OFFSET
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1,1
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COMMENTS
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There are 414 such primes for 1 <= x <= 1000, and 3280 for 1 <= x <= 10000.
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LINKS
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FORMULA
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EXAMPLE
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a(3) = 398*4^2-1 = 6367 is prime.
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MAPLE
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select(isprime, [seq(398*x^2-1, x=1..1000)]);
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MATHEMATICA
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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