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A122565
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Twin primes of form 4k+1, 4k+3.
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17
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5, 7, 17, 19, 29, 31, 41, 43, 101, 103, 137, 139, 149, 151, 197, 199, 269, 271, 281, 283, 461, 463, 521, 523, 569, 571, 617, 619, 641, 643, 809, 811, 821, 823, 857, 859, 881, 883, 1049, 1051, 1061, 1063, 1229, 1231, 1277, 1279, 1289, 1291, 1301, 1303, 1481
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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a(3) = 17 = 4*4 + 1, a(4) = 19 = 4*4 + 3.
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MAPLE
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i:=1:for k from 1 to 600 do if isprime(4*k+1) and isprime(4*k+3) then a[i]:=4*k+1:a[i+1]:=4*k+3: i:=i+2 fi od: seq(a[n], n=1..i-1);
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MATHEMATICA
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Flatten[Select[Table[4k+{1, 3}, {k, 400}], And@@PrimeQ[#] &]] (* Jayanta Basu, May 26 2013 *)
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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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