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A137198
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Sarrus numbers that become prime when two is added.
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1
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561, 645, 1905, 2465, 4371, 23001, 25761, 60701, 87249, 158369, 181901, 206601, 212421, 253241, 280601, 332949, 348161, 513629, 580337, 587861, 656601, 831405, 1207361, 1275681, 1472505, 1489665, 1678541, 1735841, 1815465, 1909001
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OFFSET
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1,1
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LINKS
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EXAMPLE
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561 is a Sarrus number and 563 is prime.
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MATHEMATICA
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Select[Range[10^5], CompositeQ[#] && PowerMod[2, (# - 1), #] == 1 && PrimeQ[# + 2] &] (* Amiram Eldar, Jun 28 2019 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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