OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
EXAMPLE
For p=5, 2*5^2-+9=(41,59); p=7, 2*7^2-+9=(89,107); p=11, 2*11^2-+9=(233,251)
MATHEMATICA
Select[Prime[Range[100]], PrimeQ[2 #^2 - 9]&&PrimeQ[2 #^2 + 9]&] (* Vincenzo Librandi, Apr 10 2013 *)
PROG
(Magma) [p: p in PrimesUpTo(10000)|IsPrime(2*p^2-9) and IsPrime(2*p^2+9)]
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Mar 17 2010
STATUS
approved