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 A091129 #22 Feb 16 2025 08:32:52
%S A091129 1,6,43,308,2399,19669,166237,1440406,12711702,113766208,1029523130,
%T A091129 9401993203,86516416092,801235499451
%N A091129 Number of primes of the form 8k+7 less than 10^n.
%C A091129 Computed by _T. D. Noe_, Dec 19 2003.
%H A091129 Bernhard Helmes, <a href="http://www.devalco.de/table_8.htm">Distribution of Primes</a>
%H A091129 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ModularPrimeCountingFunction.html">Modular Prime Counting Function</a>
%t A091129 p = Select[Table[8 i + 7, {i, 0, 10^7}], PrimeQ[#] &]; Table[Count[p, x_ /; x < 10^n], {n, 7}] (* _Robert Price_, May 28 2019 *)
%Y A091129 Cf. A091126, A091127, A091128.
%K A091129 nonn,more
%O A091129 1,2
%A A091129 _Eric W. Weisstein_, Dec 19 2003
%E A091129 a(10) from _Robert G. Wilson v_, Dec 22 2003
%E A091129 a(11)-a(14) from Bernhard Helmes (pi(AT)devalco.de), Apr 21 2010