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 A048935 #24 Feb 16 2025 08:32:40 %S A048935 0,7,148,3228,108454,4390670,208423682,11039126154 %N A048935 Number of distinct vampire numbers (definition 2) having 2n digits. %D A048935 C. A. Pickover, "Vampire Numbers." Ch. 30 in Keys to Infinity. New York: Wiley, pp. 227-231, 1995. %H A048935 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/VampireNumber.html">Vampire Number.</a> %Y A048935 Cf. A014575, A048938, A048939. %K A048935 nonn,base,hard,more %O A048935 1,2 %A A048935 _Eric W. Weisstein_ %E A048935 More terms from _Jens Kruse Andersen_, Dec 01 2002 %E A048935 a(8) from _Pierro Zachareas_, Mar 11 2021 %E A048935 a(8) corrected by _Pierro Zachareas_, Jul 03 2022