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A110480 Numbers n such that (n^2+6)/5 is prime. 3

%I #10 May 22 2017 11:54:20

%S 2,3,7,17,23,47,53,77,133,143,157,173,193,203,217,233,247,343,347,353,

%T 373,383,427,443,457,493,527,577,583,707,767,817,823,847,857,893,907,

%U 973,1003,1067,1117,1127,1153,1193,1207,1223,1243,1253,1277,1333,1397

%N Numbers n such that (n^2+6)/5 is prime.

%H Harvey P. Dale, <a href="/A110480/b110480.txt">Table of n, a(n) for n = 1..1000</a>

%F a(n) = Sqrt(A110481(n)).

%t Select[Range[1500],PrimeQ[(#^2+6)/5]&] (* _Harvey P. Dale_, May 24 2013 *)

%o (PARI) is(n)=isprime((n^2+6)/5) \\ _Charles R Greathouse IV_, May 22 2017

%Y Cf. A110481, A110482.

%K nonn

%O 1,1

%A _Giovanni Teofilatto_, Sep 09 2005

%E Corrected and extended by _Rick L. Shepherd_ and _Ray Chandler_, Sep 12 2005

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Last modified April 23 20:33 EDT 2024. Contains 371916 sequences. (Running on oeis4.)