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 A383675 #59 Jul 19 2025 11:56:31 %S A383675 0,0,0,0,1,0,2,2,1,4,9,5,8,3,9,9,12,6,14,4,5,9,8,10,13,10,8,19,17,15, %T A383675 20,16,27,16,26,14,23,18,26,22,40,23,21,18,32,24,29,15,33,21,25,33,34, %U A383675 25,25,22,47,30,40,25,37,29,38,33,47,30,41,37,45,41,46,33,42,36,52,39,48,28,49,37 %N A383675 Number of n-digit terms in A157711. %C A383675 The b-file terms are based on probable prime counts that have been verified correct (by counting proven primes) to index 200. Subsequent terms (as they get larger) seemingly face an increasing probability of counting a probable prime that is actually a composite but it is unknown if such probability is ever large enough to impact the intended proven prime count. %H A383675 Hans Havermann, <a href="/A383675/b383675.txt">Table of n, a(n) for n = 1..2500</a> %H A383675 Hans Havermann, <a href="/A383675/a383675_1.png">Combined point/points-joined plot of 2500 terms</a> %e A383675 There are two A157711 terms (1011001, 1100101) containing 7 digits, so a(7) = 2. %Y A383675 Cf. A157711. %K A383675 nonn,base %O A383675 1,7 %A A383675 _Hans Havermann_, May 29 2025