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Primes of the form 10n^2 - 7.
1

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

%S 3,83,353,1433,2243,7283,10883,12953,26003,29153,35993,75683,92153,

%T 104033,123203,129953,136883,166403,182243,224993,234083,262433,

%U 345953,368633,392033,416153,453683,466553,620003,665633,712883,728993

%N Primes of the form 10n^2 - 7.

%H Vincenzo Librandi, <a href="/A201963/b201963.txt">Table of n, a(n) for n = 1..5000</a>

%t Select[Table[10n^2-7,{n,1,1000}],PrimeQ]

%o (Magma) [a: n in [1..400] | IsPrime(a) where a is 10*n^2-7];

%K nonn,easy

%O 1,1

%A _Vincenzo Librandi_, Dec 07 2011