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 A369000 #10 Jan 18 2024 18:13:10 %S A369000 0,0,0,0,0,0,1,1,0,0,2,9,18 %N A369000 a(n) is the number of integers, not semiprimes, whose arithmetic derivative is equal to the n-th primorial. %C A369000 a(n) = number of solutions k to equation A003415(k) = A002110(n) with A001222(k) > 2. %H A369000 Antti Karttunen, <a href="/A369000/a369000.txt">PARI-program</a> %H A369000 <a href="/index/Pri#primorial_numbers">Index entries for sequences related to primorial numbers</a> %F A369000 a(n) = A351029(n) - A116979(n). %o A369000 (PARI) \\ See the attached PARI-program. %Y A369000 Cf. A001222, A002110, A003415, A116979, A351029, A366890 (solutions themselves). %K A369000 nonn,hard,more %O A369000 1,11 %A A369000 _Antti Karttunen_, Jan 16 2024