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 A356531 #13 Oct 02 2022 00:58:29
%S A356531 599,691,829,1151,2347,2393,3037,3313,3359,4463,4831,5107,5521,5659,
%T A356531 6763,8741,9109,9661,10627,10949,11593,12743,13249,14537,14767,14951,
%U A356531 15319,15733,16883,17573
%N A356531 Primes p == 1 (mod 23) which are norms of elements in the 23rd cyclotomic field.
%C A356531 Primes which are norms of principal ideals in the 23rd cyclotomic ring of integers.
%C A356531 The class number of the 23rd cyclotomic field is 3, so about 1/3 of primes == 1 (mod 23) should be norms of principal ideals.
%C A356531 Is it true that a(n) == 1 (mod 46)? - _Hugo Pfoertner_, Aug 13 2022
%D A356531 Reimer Bruchmann, Quadratic and cyclotomic rings of integers, March 26th, 2022, 487-534.
%e A356531 2347 is in this sequence since it is the norm of the element x^7-x^3-x-1 where x is a 23rd primitive root of unity.
%o A356531 (PARI) a(n)={K=bnfinit(polcyclo(23)); ct=0; p=1; while(ct<n, p=nextprime(p+1); if(p%23==1 && #bnfisintnorm(K, p)>0, ct++); ); return(p)}
%K A356531 nonn
%O A356531 1,1
%A A356531 _Paul Vanderveen_, Aug 10 2022