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 A180544 #10 Oct 30 2023 11:14:54 %S A180544 131,181,311,331,337,359,389,811,839,859,881,887,1301,1361,1367,1381, %T A180544 1439,1489,1801,1831,1861,1867,2039,2089,2237,2287,2351,2357,2851, %U A180544 2857,3011,3037,3089,3167,3191,3209,3221,3307,3319,3361,3389,3461,3467,3527 %N A180544 Primes that become a different prime under the mapping 3 <=> 8. %H A180544 Robert Price, <a href="/A180544/b180544.txt">Table of n, a(n) for n = 1..1604</a> %H A180544 <a href="/index/Pri#primes">Index to Primes</a>, Primes that become a different prime under some mapping. %t A180544 fQ[n_] := Block[{id = IntegerDigits@n}, (MemberQ[id, 3] || MemberQ[id, 8]) && PrimeQ[ FromDigits[ id /. {3 -> 8, 8 -> 3}] ]]; Select[ Prime@ Range@ 500, fQ] %Y A180544 Cf. A171044, A175791, A180517 thru A180559, A175789, A180560, A180561. %K A180544 base,nonn %O A180544 1,1 %A A180544 _Zak Seidov_ and _Robert G. Wilson v_, Sep 09 2010