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 A038817 #20 Apr 03 2023 10:36:09
%S A038817 5761455,11078937,16252325,21336326,26355867,31324703,36252931,
%T A038817 41146179,46009215,50847534,55662470,60454705,65228333,69985473,
%U A038817 74726528,79451833,84163019,88862422,93547928,98222287,102886526,107540122
%N A038817 Number of primes less than n*10^8.
%H A038817 Robert G. Wilson v, <a href="/A038817/b038817.txt">Table of n, a(n) for n = 1..10000</a>
%H A038817 Andrew R. Booker, <a href="https://t5k.org/nthprime/">The Nth Prime Page</a>
%H A038817 Thomas R. Nicely, <a href="https://faculty.lynchburg.edu/~nicely/index.html">Some Results of Computational Research in Prime Numbers</a> [See local copy in A007053]
%H A038817 Tomás Oliveira e Silva, <a href="http://sweet.ua.pt/tos/primes.html">Tables of values of pi(x) and of pi2(x)</a>
%t A038817 Table[ PrimePi[ n*10^8 ], {n, 1, 22}]
%o A038817 (PARI) a(n)=primepi(10^8*n) \\ _Charles R Greathouse IV_, Apr 29 2015
%Y A038817 Cf. A038801, A028505, A038812, A038813, A038814, A038815, A038816, A038818, A038819, A038820, A038821, A080122, A080123, A080124, A080125, A080126, A080127, A080128, A080129.
%K A038817 nonn
%O A038817 1,1
%A A038817 _Jeff Burch_
%E A038817 Edited and extended by _Robert G. Wilson v_, Jan 29 2003