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 A331620 #4 Feb 22 2020 16:31:33 %S A331620 2,4,6,12,14,18,30,46,74,84,102,114,120,150,192,242,306,370,414,570, %T A331620 790,800,888,924,1024,1152,1310,1790,2262,2754,3472,6270,6458,9334, %U A331620 12628,14200,16406,18050,18358,18492,19852,23180,28730,32592,33524,38696,39774,40944,45444,46408,49624,54704,60740 %N A331620 Records of A058249: (Smallest prime >= 2^n) - (largest prime <= 2^n). %Y A331620 Cf. A058249. %K A331620 nonn %O A331620 1,1 %A A331620 _Robert G. Wilson v_, Jan 22 2020