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A120023
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Numbers n such that 2*6^n+1 is prime.
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2
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0, 1, 2, 3, 4, 10, 11, 17, 20, 28, 41, 48, 57, 58, 59, 71, 208, 972, 993, 1432, 2001, 2175, 2622, 3419, 3720, 4860, 7300, 7402, 14988, 15774, 18510
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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REFERENCES
| If 6^n is of the form T(x,y)=2xy+x+y [A083487] then 2*6^n+1 is not prime. [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 13 2010]
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MATHEMATICA
| Select[Range[0, 2000], PrimeQ[2*6^# + 1] &] (* From Vladimir Joseph Stephan Orlovsky, Jan 31 2012 *)
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CROSSREFS
| Cf. A057472, A120024, A205771
Sequence in context: A047455 A202426 A039002 * A115897 A116019 A087460
Adjacent sequences: A120020 A120021 A120022 * A120024 A120025 A120026
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KEYWORD
| nonn
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AUTHOR
| Pierre CAMI (pierre-cami(AT)bbox.fr), Jun 04 2006
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EXTENSIONS
| More terms from Pierre CAMI (pierre-cami(AT)bbox.fr), Jun 16 2006
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