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A155133
Numbers n >= 0 such that 5n^2+4n+1 is prime.
1
2, 4, 8, 10, 12, 18, 20, 30, 40, 44, 52, 54, 58, 62, 70, 72, 80, 84, 92, 98, 104, 114, 120, 124, 130, 132, 138, 140, 158, 168, 172, 174, 182, 188, 192, 194, 212, 214, 222, 238, 254, 262, 268, 274, 280, 288, 290, 294, 300, 302, 304, 314, 318, 328, 338, 342, 348
OFFSET
1,1
LINKS
EXAMPLE
For n=2, p=29; n=30, p=421; n=44, p=9857.
MATHEMATICA
Select[Range[0, 400], PrimeQ[5#^2+4#+1]&] (* Vincenzo Librandi, Sep 24 2012 *)
PROG
(Magma) [n: n in [0..450] | IsPrime(5*n^2+4*n+1)]; Vincenzo Librandi, Sep 24 2012
CROSSREFS
Sequence in context: A032368 A134533 A089953 * A331669 A154788 A219617
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Jan 20 2009
STATUS
approved