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 A355983 #13 Jul 22 2022 20:51:43
%S A355983 23,29,61,67,211,233,239,251,257,271,277,293,401,409,421,443,449,461,
%T A355983 463,467,487,613,617,619,631,653,659,673,677,691,809,821,823,827,829,
%U A355983 863,881,883,887,2111,2113,2129,2131,2137,2141,2143,2153,2161,2179,2309,2311,2333,2339,2341,2347,2351
%N A355983 Primes whose reversal is a multiple of 4.
%C A355983 Equivalently, primes starting with 21, 23, 25, 27, 29, 40, 42, 44, 46, 48, 61, 63, 65, 67, 69, 80, 82, 84, 86, 88.
%C A355983 Subsequence of A355430.
%e A355983 67 is a term since 67 is prime and 76 is divisible by 4.
%t A355983 Select[Prime[Range[350]], Divisible[IntegerReverse[#], 4] &] (* _Amiram Eldar_, Jul 22 2022 *)
%o A355983 (PARI) isok(p) = isprime(p) && !(fromdigits(Vecrev(digits(p))) % 4); \\ _Michel Marcus_, Jul 22 2022
%Y A355983 Primes whose reversal is a multiple of k: A355430 (k=2), {3} (k=3), this sequence (k=4), A045711 (k=5), A087762 (k=7), {11} (k=11), A087764 (k=13), A087765 (k=17), A087766 (k=19), A087767 (k=23).
%K A355983 nonn,base
%O A355983 1,1
%A A355983 _Bernard Schott_, Jul 22 2022