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A083022
Numbers n such that 4*n^2 - 3 is prime.
3
2, 4, 5, 7, 10, 13, 16, 17, 20, 22, 23, 29, 32, 34, 40, 43, 44, 46, 49, 55, 56, 59, 62, 64, 68, 70, 71, 73, 82, 86, 95, 97, 101, 103, 104, 109, 110, 125, 127, 133, 134, 148, 149, 152, 155, 160, 161, 163, 164, 166, 170, 175, 178, 181, 185, 208, 209, 218, 220
OFFSET
1,1
LINKS
FORMULA
a(n) = A028873(n)/2.
MATHEMATICA
Select[Range[300], PrimeQ[4 #^2 - 3] &] (* Vincenzo Librandi, Oct 05 2012 *)
PROG
(Magma) [n: n in [1..300] | IsPrime(4*n^2 - 3)]; // Vincenzo Librandi, Oct 05 2012
(PARI) is(n)=isprime(4*n^2-3) \\ Charles R Greathouse IV, May 22 2017
CROSSREFS
Cf. A028874.
Sequence in context: A194462 A163267 A036559 * A279022 A376080 A226807
KEYWORD
nonn,easy
AUTHOR
Hugo Pfoertner, May 31 2003
STATUS
approved