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 A075239 #5 May 23 2021 02:50:46 %S A075239 2,3,5,7,11,13,17,19,23,37,43,47,67,71,73,79,83,97,101,109,113,127, %T A075239 139,151,157,163,173,179,181,191,193,197,227,229,239,241,331,337,353, %U A075239 367,373,379,383,389,397,419,433,439,457,463,479,571,577,593,599,601,607 %N A075239 Primes whose base 9 reversal is also prime. %H A075239 Amiram Eldar, <a href="/A075239/b075239.txt">Table of n, a(n) for n = 1..10000</a> %t A075239 Prime[ Select[ Range[115], PrimeQ[ FromDigits[ Reverse[ IntegerDigits[ Prime[ # ], 9]], 9]] &]] %Y A075239 Cf. A007500, A074832, A074833, A074834, A075235, A075236, A075237, A075238. %K A075239 base,easy,nonn %O A075239 1,1 %A A075239 _Robert G. Wilson v_, Sep 09 2002