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 A080122 #15 Apr 03 2023 10:36:10
%S A080122 346065536839,675895909271,1000121668853,1320811971702,1638923764567,
%T A080122 1955010428258,2269432871304,2582444113487,2894232250783,
%U A080122 3204941750802,3514687156436,3823561506566,4131641836725,4438993433550,4745670621117
%N A080122 Number of primes less than n*10^13.
%H A080122 Robert G. Wilson v, <a href="/A080122/b080122.txt">Table of n, a(n) for n = 1..10000</a>
%H A080122 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 A080122 Tomás Oliveira e Silva, <a href="http://sweet.ua.pt/tos/primes.html">Tables of values of pi(x) and of pi2(x)</a>
%H A080122 Andrew R. Booker, <a href="https://t5k.org/nthprime/">The Nth Prime Page</a>
%t A080122 Table[ PrimePi[ n*10^13 ], {n, 1, 9}]
%o A080122 (PARI) a(n)=primepi(10^13*n) \\ _Charles R Greathouse IV_, Apr 29 2015
%Y A080122 Cf. A038801, A028505, A038812, A038813, A038814, A038815, A038816, A038817, A038818, A038819, A038820, A038821, A080123, A080124, A080125, A080126, A080127, A080128, A080129.
%K A080122 nonn
%O A080122 1,1
%A A080122 _Robert G. Wilson v_ and _Jeff Burch_, Jan 29 2003