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A153355
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Numbers n such that 5n-1 is a prime
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2
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4, 6, 12, 16, 18, 22, 28, 30, 36, 40, 46, 48, 54, 70, 72, 76, 78, 82, 84, 88, 90, 96, 100, 102, 114, 120, 124, 132, 142, 144, 148, 154, 162, 166, 168, 172, 184, 186, 202, 204, 208, 210, 214, 222, 226, 246, 250, 252, 256, 258, 264, 280, 282, 286, 288, 292, 298
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| One more than the value of A024897 at the same index. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 05 2009]
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FORMULA
| The set of numbers (1+A030433(k))/5, k=1,2,3,4,.... [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 03 2009]
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EXAMPLE
| For n=2, 5n-1=19; for n=30, 5n-1=149
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MATHEMATICA
| Select[Range[400], PrimeQ[5#-1]&] (*From Vladimir Joseph Stephan Orlovsky, Feb 25 2011*)
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CROSSREFS
| Sequence in context: A074870 A104236 A122781 * A024904 A172445 A139056
Adjacent sequences: A153352 A153353 A153354 * A153356 A153357 A153358
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KEYWORD
| nonn
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AUTHOR
| Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Dec 24 2008
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EXTENSIONS
| Extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 05 2009
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