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 A065587 #14 Sep 06 2023 06:57:24 %S A065587 2,41,443,4441,44449,444443,44444453,444444421,444444443,4444444447, %T A065587 44444444441,444444444443,44444444444459,444444444444421, %U A065587 4444444444444423,44444444444444411,444444444444444413,4444444444444444409,44444444444444444479,44444444444444444447 %N A065587 Smallest prime beginning with exactly n 4's. %H A065587 M. F. Hasler, <a href="/A065587/b065587.txt">Table of n, a(n) for n = 0..200</a> %Y A065587 Cf. A037061, A065584 - A065592. %K A065587 nonn,base %O A065587 0,1 %A A065587 _Robert G. Wilson v_, Nov 28 2001 %E A065587 Offset corrected by _Sean A. Irvine_, Sep 06 2023