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A111147
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Numbers n such that 5*n^2 + 1 is prime.
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0
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6, 18, 36, 42, 84, 102, 108, 132, 144, 150, 162, 168, 174, 186, 192, 246, 276, 288, 300, 312, 330, 354, 372, 384, 396, 402, 456, 462, 498, 510, 522, 528, 552, 564, 570, 582, 612, 636, 648, 708, 738, 804, 816, 834, 840, 846, 882, 888, 924, 930, 942, 972, 990
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| If n=312 then 5*n^2 + 1 = 486721 (prime).
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MATHEMATICA
| Select[Range[1000], PrimeQ[5*#^2 + 1] &] - Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Feb 26 2006
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CROSSREFS
| Sequence in context: A181510 A038343 A110965 * A172522 A152539 A069958
Adjacent sequences: A111144 A111145 A111146 * A111148 A111149 A111150
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KEYWORD
| nonn
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AUTHOR
| Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Oct 18 2005
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EXTENSIONS
| More terms from Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Feb 26 2006
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