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Primes of the form 3n^2 + 7.
1

%I #6 Sep 08 2022 08:46:01

%S 7,19,199,307,439,1459,2707,3079,4339,7507,10099,13879,15559,19207,

%T 31219,36307,43207,50707,57139,65719,117619,134839,145207,147859,

%U 172807,175699,187507,231859,248839,288307,303379,326707,330679

%N Primes of the form 3n^2 + 7.

%H Vincenzo Librandi, <a href="/A201479/b201479.txt">Table of n, a(n) for n = 1..5000</a>

%t Select[Table[3n^2+7,{n,0,1000}],PrimeQ]

%o (Magma) [a: n in [0..400] | IsPrime(a) where a is 3*n^2+7];

%K nonn,easy

%O 1,1

%A _Vincenzo Librandi_, Dec 02 2011