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 A340712 #10 Mar 24 2021 15:51:53 %S A340712 557,248137,4085791,519807973 %N A340712 Primes p such that p divides (2 + product of primes < p). %H A340712 Norman Luhn, <a href="https://primes.utm.edu/curios/page.php?curio_id=2284">Prime Curios! 557</a> %e A340712 557 is in the sequence because 2 + A034386(557 - 1) = 557 * 4627335992...5904782776 (220 digits). %o A340712 (Python) %o A340712 from sympy import nextprime %o A340712 def aupto(limit): %o A340712 p, psharp = 3, 2 %o A340712 while p <= limit: %o A340712 if (psharp+2)%p == 0: print(p, end=", ") %o A340712 psharp, p = psharp*p, nextprime(p) %o A340712 aupto(500000) # _Michael S. Branicky_, Mar 24 2021 %Y A340712 Cf. A338543, A062347, A034386. %K A340712 nonn,hard,more %O A340712 1,1 %A A340712 _Martin Ehrenstein_, Jan 16 2021