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A165667 Primes p such that (p^2-2)/7 is also prime. 3

%I #5 May 13 2013 01:49:10

%S 11,17,31,53,67,73,109,151,199,241,269,389,563,599,613,661,739,773,

%T 809,977,983,991,1033,1061,1123,1151,1187,1193,1249,1277,1319,1327,

%U 1453,1487,1543,1831,1879,1907,2027,2083,2089,2237,2251,2383,2447,2579,2593,2621,2671

%N Primes p such that (p^2-2)/7 is also prime.

%H Harvey P. Dale, <a href="/A165667/b165667.txt">Table of n, a(n) for n = 1..1000</a>

%F A000040 \ A165666.

%e For p=11, (11^2-2)/7=17. For p=17,(17^2-2)/7=41. For p=31,(31^2-2)/7=137.

%t Select[Prime[Range[500]],PrimeQ[(#^2-2)/7]&] (* _Harvey P. Dale_, Jan 06 2013 *)

%Y Cf. A165666, A165668

%K nonn

%O 1,1

%A _Vincenzo Librandi_, Sep 24 2009

%E More terms from R. J. Mathar and _Charles R Greathouse IV_, Oct 12 2009

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Last modified March 29 08:01 EDT 2024. Contains 371265 sequences. (Running on oeis4.)