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A174364 Primes p such that 2*p^3-+15 are also prime. 1

%I #7 Sep 08 2022 08:45:51

%S 11,163,449,1103,1367,1627,3037,3089,3517,3529,4639,4903,5897,6661,

%T 8377,8951,9787,11329,11981,13697,14783,15017,16447,16993,17609,19597,

%U 20509,21799,21881,22157,25537,25693,25903,26119,26189,26947,27917,27961

%N Primes p such that 2*p^3-+15 are also prime.

%H Vincenzo Librandi, <a href="/A174364/b174364.txt">Table of n, a(n) for n = 1..1000</a>

%e For p^11, 2*11^3-+15=(2647,2677); p=163, 2*163^3-+15=(8661479,8661509).

%t Select[Prime[Range[4000]], And@@PrimeQ[2 #^3 + {15, -15}]&] (* _Vincenzo Librandi_, Apr 10 2013 *)

%o (Magma) [p: p in PrimesUpTo(100000)|IsPrime(2*p^3-15) and IsPrime(2*p^3+15)]

%K nonn,easy

%O 1,1

%A _Vincenzo Librandi_, Mar 17 2010

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Last modified March 28 04:13 EDT 2024. Contains 371235 sequences. (Running on oeis4.)