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Search: id:A120227
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| A120227 |
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Numbers n such that a+n and a*n+1 are prime, case a=5. |
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+0
4
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| 2, 6, 8, 12, 14, 26, 36, 38, 42, 48, 54, 56, 62, 66, 84, 92, 98, 104, 108, 126, 132, 152, 162, 176, 188, 194, 206, 218, 234, 236, 246, 258, 264, 272, 276, 302, 306, 344, 348, 362, 374, 416, 426, 428, 444, 456, 462, 474, 482, 504, 518, 542, 558, 572, 594, 602
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Case a=4 A120226.
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MATHEMATICA
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Reap[Do[Do[If[PrimeQ[{n+x, n*x+1}]=={True, True}, Sow[x]], {x, 2, 1000, 2}], {n, 5, 5}]][[2, 1]]
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CROSSREFS
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Cf. A092945, A106057 A085063, A120223, A120224, A120225, A120226.
Sequence in context: A102166 A024894 A153880 this_sequence A138626 A064796 A083769
Adjacent sequences: A120224 A120225 A120226 this_sequence A120228 A120229 A120230
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KEYWORD
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nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Jun 10 2006
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