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 A319135 #33 Mar 14 2021 01:03:38 %S A319135 1,1,1,2,1,1,2,1,1,2,1,3,1,2,1,1,3,2,1,1,2,1,3,1,4,2,1,1,3,2,1,1,4,2, %T A319135 1,3,1,2,1,1,4,3,2,1,5,1,2,1,3,1,4,2,1,1,5,3,2,1,1,4,2,1,3,1,2,1,5,1, %U A319135 6,4,3,2,1,1,2,1,3,1,5,4,2,1,1,6,3,2,1 %N A319135 Irregular triangle read by rows in which row n lists the positive divisors of n that are <= sqrt(n) in decreasing order. %C A319135 Reversing rows gives A161906. %F A319135 a(n) * A161908(n) = A340792(n) %F A319135 A161906(n) * A340791(n) = A340792(n) %F A319135 A027750(n) * A056538(n) = A061017(n) %e A319135 Triangle begins: %e A319135 1 %e A319135 1 %e A319135 1 %e A319135 2 1 %e A319135 1 %e A319135 2 1 %e A319135 1 %e A319135 2 1 %e A319135 3 1 %e A319135 2 1 %e A319135 1 %e A319135 3 2 1 %e A319135 1 %e A319135 2 1 %e A319135 3 1 %e A319135 4 2 1 %o A319135 (PARI) row(n) = Vecrev(select(x->(x<=sqrt(n)), divisors(n))); \\ _Jinyuan Wang_, Mar 13 2021 %Y A319135 Cf. A038548 (row widths), A033676 (first column), A333750 (second column), A161906 (rows reversed), A027750, A056538, A061017, A340791, A340792. %K A319135 nonn,tabf %O A319135 1,4 %A A319135 _Charles Kusniec_, Feb 27 2021 %E A319135 More terms from _Jinyuan Wang_, Mar 13 2021