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 A370010 #9 Feb 16 2024 15:08:27
%S A370010 7,11,19,23,43,47,67,73,89,113,113,139,163,167,181,211,233,241,263,
%T A370010 283,283,313,331,353,383,401,409,421,433,449,503,523,547,547,593,601,
%U A370010 619,647,661,691,709,719,761,769,787,787,839,887,907,911,929,953,953,997
%N A370010 a(n) is the greatest prime less than 4*prime(n).
%e A370010 7 < 4*2 < 11 < 4*3 < 13 < 17 < 19 < 5*3 < 23, so (a(1), a(2), a(3)) = (7,11,19).
%t A370010 Table[Prime[PrimePi[4*Prime[n]]], {n,1,200}]
%o A370010 (PARI) a(n) = precprime(4*prime(n)); \\ _Michel Marcus_, Feb 10 2024
%Y A370010 Cf. A000040, A001749, A059786, A059788, A370008, A370011.
%K A370010 nonn
%O A370010 1,1
%A A370010 _Clark Kimberling_, Feb 09 2024