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 A369249 #7 Jan 22 2024 21:58:08 %S A369249 3,7,11,19,23,31,43,47,59,67,79,83,107,127,139,163,179,223,227,283, %T A369249 307,347,367,379,443,463,499,523,547,571,619,643,659,683,787,827,883, %U A369249 907,947,967,1039,1087,1123,1171,1259,1327,1423,1459,1483,1523,1567,1579,1627,1699,1723,1747,1759,1787,1987,1999,2083,2143 %N A369249 Primes of the form 4*m+3 for which there is no representation as a sum (p*q + p*r + q*r) with three odd primes p <= q <= r. %H A369249 Antti Karttunen, <a href="/A369249/b369249.txt">Table of n, a(n) for n = 1..20000</a> %o A369249 (PARI) isA369249(n) = ((3==(n%4)) && isprime(n) && !A369054(n)); \\ Needs also program from A369054. %Y A369249 Intersection of A002145 and A369056. %Y A369249 Setwise difference A002145 \ A369250. %Y A369249 Cf. A369054. %Y A369249 Cf. also A189483. %K A369249 nonn %O A369249 1,1 %A A369249 _Antti Karttunen_, Jan 22 2024