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 A140547 #11 Jul 12 2025 21:32:46 %S A140547 2,5,11,59,67,101,109,131,151,179,193,197,199,211,227,257,263,269,277, %T A140547 311,313,331,353,367,397,401,461,463,479,487,491,503,521,523,541,563, %U A140547 569,571,593,599,601,613,619,647,659,661,677,727,739,757,769,773,809 %N A140547 Primes p such that neither p - 10 nor p + 10 is prime. %t A140547 Select[Prime[Range[140]],!PrimeQ[#+10]&&(!PrimeQ[#-10]||#<10)&] (* _James C. McMahon_, Jul 12 2025 *) %Y A140547 Cf. A023203, A092146. %K A140547 nonn,easy %O A140547 1,1 %A A140547 _Juri-Stepan Gerasimov_, Jun 30 2008, Nov 07 2009 %E A140547 Edited by _Charles R Greathouse IV_, Mar 25 2010