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A171138 Primes of the form 7*p^2+7*p-1 (with p=prime). 2

%I #6 Sep 08 2022 08:45:49

%S 41,83,2141,2659,3863,6089,15791,31891,37813,66541,90173,160663,

%T 187123,210713,349663,362291,368689,401519,442763,464141,486023,

%U 679223,769243,904679,945391,976513,1061969,1173829,1231859,1315453,1352119,1465141

%N Primes of the form 7*p^2+7*p-1 (with p=prime).

%H Vincenzo Librandi, <a href="/A171138/b171138.txt">Table of n, a(n) for n = 1..1000</a>

%t Select[Table[7p^2 + 7p - 1,{p, Prime[Range[400]]}], PrimeQ] (* _Vincenzo Librandi_, Oct 13 2012 *)

%o (Magma) [a: p in PrimesInInterval(1, 800) | IsPrime(a) where a is 7*p^2 + 7*p - 1]; // _Vincenzo Librandi_, Oct 13 2012

%Y Cf. A171139.

%K nonn,easy

%O 1,1

%A _Vincenzo Librandi_, Jan 26 2010

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Last modified February 22 19:33 EST 2024. Contains 370260 sequences. (Running on oeis4.)