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Search: id:A153185
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| A153185 |
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Numbers n such that n and 3n-2 are both prime |
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3
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| 3, 5, 7, 11, 13, 23, 43, 47, 53, 61, 67, 71, 103, 113, 127, 137, 163, 167, 181, 191, 193, 211, 251, 257, 263, 271, 277, 293, 307, 313, 331, 337, 347, 373, 401, 431, 433, 443, 461, 467, 487, 491, 523
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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For n=3, 3n-2=7; For n=523, 3n-2=1567
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MATHEMATICA
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lst={}; Do[p=Prime[n]; If[PrimeQ[3*p-2], AppendTo[lst, p]], {n, 5!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Dec 22 2008]
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CROSSREFS
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Cf. A153183, A153184
Cf. A153184 [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Dec 22 2008]
Sequence in context: A154319 A080114 A088878 this_sequence A155916 A038979 A093988
Adjacent sequences: A153182 A153183 A153184 this_sequence A153186 A153187 A153188
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KEYWORD
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nonn
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AUTHOR
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Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Dec 20 2008, Dec 22 2008
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