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 A199743 #43 Oct 04 2021 13:52:55 %S A199743 15,32,96,960,5280,640320 %N A199743 Rounded near-integers (exp(Pi*sqrt(h)) - 744)^(1/3) where h is A003173(n+3) (Heegner numbers of the form 4p-1 where p is prime). %F A199743 a(n) = (-j((1 + i*sqrt(h(n))) / 2))^(1/3) where h(n) = A003173(n+3) and j(x) is the j-invariant. - _Andrey Zabolotskiy_, Sep 30 2021 %e A199743 a(1) = 15 because 15^3 + 744 ~ exp(Pi*sqrt(7)). %e A199743 a(2) = 32 because 32^3 + 744 ~ exp(Pi*sqrt(11)). %e A199743 a(3) = 96 because 96^3 + 744 ~ exp(Pi*sqrt(19)). %e A199743 a(4) = 960 because 960^3 + 744 ~ exp(Pi*sqrt(43)). %e A199743 a(5) = 5280 because 5280^3 + 744 ~ exp(Pi*sqrt(67)). %e A199743 a(6) = 640320 because 640320^3 + 744 ~ exp(Pi*sqrt(163)). %Y A199743 Cf. A003173, A305500. %Y A199743 A267195 is a supersequence (negated). %K A199743 nonn,fini,full %O A199743 1,1 %A A199743 _Artur Jasinski_, Nov 09 2011