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A243811 Numbers n such that 2*n+3 and 2*n+5 are both prime. 2

%I #17 Sep 08 2022 08:46:08

%S 0,1,4,7,13,19,28,34,49,52,67,73,88,94,97,112,118,133,139,154,172,208,

%T 214,229,259,283,298,307,319,328,403,409,412,427,439,508,514,523,529,

%U 544,574,613,637,643,649,658,712,724,739,742,802,808,832,847,859,892,934

%N Numbers n such that 2*n+3 and 2*n+5 are both prime.

%H Vincenzo Librandi, <a href="/A243811/b243811.txt">Table of n, a(n) for n = 1..1000</a>

%F a(n) = A040040(n)-2.

%t Select[Range[0, 1000], PrimeQ[2 # + 3] && PrimeQ[2 # + 5] &]

%o (Magma) [n: n in [0..1000] | IsPrime(2*n+3) and IsPrime(2*n+5)];

%Y Cf. A040040, A067076, A089038.

%K nonn,easy,less

%O 1,3

%A _Vincenzo Librandi_, Jun 11 2014

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Last modified March 28 17:42 EDT 2024. Contains 371254 sequences. (Running on oeis4.)