This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A167462 #15 Sep 08 2022 08:45:48 %S A167462 7,13,19,31,37,41,43,61,67,73,79,83,97,103,107,109,113,127,139,151, %T A167462 157,163,167,173,181,191,193,199,211,223,229,239,241,251,269,271,277, %U A167462 283,293,307,313,317,331,337,347,349,359,367,373,379,397,409,419,421 %N A167462 Primes p such that 2*p-5 is composite. %H A167462 Vincenzo Librandi, <a href="/A167462/b167462.txt">Table of n, a(n) for n = 1..1000</a> %t A167462 Select[Range[4, 3000], PrimeQ[#]&& ! PrimeQ[2 # - 5] &](* _Vincenzo Librandi_, Sep 15 2013 *) %t A167462 Select[Prime[Range[100]],CompositeQ[2#-5]&] (* _Harvey P. Dale_, May 16 2016 *) %o A167462 (Magma) [p: p in PrimesInInterval(4,600)| not IsPrime(2*p-5)]; // _Vincenzo Librandi_, Sep 15 2013 %Y A167462 Cf. A063909. %K A167462 nonn,easy %O A167462 1,1 %A A167462 _Vincenzo Librandi_, Nov 04 2009 %E A167462 Corrected (229 inserted) by _R. J. Mathar_, Nov 30 2009 %E A167462 Corrected (3 deleted, as 2*3-5 = 1 and 1 is not composite) by _Harvey P. Dale_, May 16 2016