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A257121
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Numbers m with 9*m + 3*r - 1 and 9*m + 3*r + 1 twin prime for some r = 0,1,2.
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4
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0, 1, 2, 3, 4, 6, 8, 11, 12, 15, 16, 20, 21, 22, 25, 26, 30, 31, 34, 38, 46, 48, 51, 58, 63, 66, 68, 71, 73, 90, 91, 92, 95, 98, 113, 114, 116, 118, 121, 128, 136, 142, 143, 144, 146, 158, 161, 164, 165, 178, 180, 185, 188, 191, 198, 208, 214, 216, 222, 225, 231, 232, 234, 236, 238, 248, 252, 256, 260, 264, 283, 288, 295, 298, 301, 303, 310, 311, 330, 333
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OFFSET
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1,3
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COMMENTS
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By the conjecture in A257317, any positive integer should be the sum of two distinct terms of the current sequence one of which is even.
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LINKS
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EXAMPLE
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a(1) = 0 since {9*0+3*2-1,9*0+3*2+1} = {5,7} is a twin prime pair.
a(2) = 1 since {9*1+3*1-1,9*1+3*1+1} = {11,13} is a twin prime pair.
a(3) = 2 since {9*2+3*0-1,9*2+3*0+1} = {17,19} is a twin prime pair.
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MATHEMATICA
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TQ[m_]:=PrimeQ[3m-1]&&PrimeQ[3m+1]
PQ[m_]:=TQ[3*m]||TQ[3*m+1]||TQ[3*m+2]
n=0; Do[If[PQ[m], n=n+1; Print[n, " ", m]], {m, 0, 340}]
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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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