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 A106128 #18 Oct 13 2022 16:52:00 %S A106128 1,3,6,36,46,78,6915,6916,613375,613378,613404,613406,613414,613438, %T A106128 613448,613454,613456,613508,613519,613522,613532,613559,613568, %U A106128 613570,613582,613586,613598,58155528,58155536,58155549,6384425454,6384425520,6384425522,6384425528,6384425638 %N A106128 Numbers k such that the k-th semiprime == 3 (mod k). %C A106128 a(48) > 10^12. - _Lucas A. Brown_, Oct 13 2022 %H A106128 Lucas A. Brown, <a href="/A106128/b106128.txt">Table of n, a(n) for n = 1..47</a> %H A106128 Lucas A. Brown, <a href="https://github.com/lucasaugustus/oeis/blob/main/semiprimemods.py">semiprimemods.py</a> %e A106128 a(3) = 6 is a term because the 6th semiprime is 15 and 15 == 3 (mod 6). %Y A106128 Cf. A001358, A357807. %K A106128 hard,nonn %O A106128 1,2 %A A106128 _Shyam Sunder Gupta_, May 07 2005 %E A106128 a(28)-a(30) from _Donovan Johnson_, Oct 29 2008 %E A106128 a(1), a(2), and a(31)-a(47) by _Lucas A. Brown_, Oct 19 2020