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 A065590 #15 Sep 06 2023 06:57:29 %S A065590 2,7,773,77711,77773,7777709,77777719,777777701,777777773,77777777717, %T A065590 777777777713,777777777773,7777777777771,777777777777719, %U A065590 777777777777773,77777777777777711,777777777777777737,7777777777777777793,77777777777777777729,77777777777777777771 %N A065590 Smallest prime beginning with exactly n 7's. %H A065590 M. F. Hasler, <a href="/A065590/b065590.txt">Table of n, a(n) for n = 0..200</a> %Y A065590 Cf. A037067, A065581, A065584 - A065592. %K A065590 nonn,base %O A065590 0,1 %A A065590 _Robert G. Wilson v_, Nov 28 2001 %E A065590 Corrected by _Don Reble_, Jan 17 2007 %E A065590 Offset corrected by _Sean A. Irvine_, Sep 06 2023