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 A180539 #11 Oct 30 2023 11:14:20
%S A180539 127,197,211,227,241,271,277,283,421,491,523,593,727,797,911,941,971,
%T A180539 977,983,997,1021,1091,1123,1193,1201,1213,1223,1231,1423,1493,1627,
%U A180539 1697,1901,1913,1931,1993,2011,2137,2161,2207,2267,2273,2293,2311,2341
%N A180539 Primes that become a different prime under the mapping 2 <=> 9.
%H A180539 Robert Price, <a href="/A180539/b180539.txt">Table of n, a(n) for n = 1..2084</a>
%H A180539 <a href="/index/Pri#primes">Index to Primes</a>, Primes that become a different prime under some mapping.
%t A180539 fQ[n_] := Block[{id = IntegerDigits@n}, (MemberQ[id, 2] || MemberQ[id, 9]) && PrimeQ[ FromDigits[ id /. {2 -> 9, 9 -> 2}] ]]; Select[ Prime@ Range@ 350, fQ]
%Y A180539 Cf. A171051, A175791, A180517 thru A180559, A175789, A180560, A180561.
%K A180539 base,nonn
%O A180539 1,1
%A A180539 _Zak Seidov_ and _Robert G. Wilson v_, Sep 09 2010