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 A348135 #11 Oct 09 2021 06:30:27 %S A348135 1,1,2,1,3,1,2,4,1,5,1,2,3,6,1,3,7,1,2,4,8,1,9,1,2,5,10,1,11,1,2,3,4, %T A348135 6,12,1,13,1,2,3,6,7,14,1,3,5,7,15,1,2,4,8,16,1,17,1,2,9,18,1,19,1,2, %U A348135 4,5,10,20,1,5,21,1,2,11,22,1,23,1,2,3,4,6,8,12,24 %N A348135 Irregular triangle T(n, k), n > 0, k = 1..A067399(n), read by rows; the n-th row gives, in ascending order, the distinct integers k such that A067138(k, m) = n for some m. %C A348135 The n-th row corresponds to the divisors of n in OR-numbral arithmetic. %H A348135 Rémy Sigrist, <a href="/A348135/b348135.txt">Table of n, a(n) for n = 1..7412</a> (first 1024 rows flattened) %H A348135 Rémy Sigrist, <a href="/A348135/a348135.gp.txt">PARI program for A348135</a> %H A348135 <a href="/index/Di#dismal">Index entries for sequences related to dismal (or lunar) arithmetic</a> %F A348135 T(n, 1) = 1. %F A348135 T(n, A067399(n)) = n. %e A348135 The triangle starts: %e A348135 1: [1] %e A348135 2: [1, 2] %e A348135 3: [1, 3] %e A348135 4: [1, 2, 4] %e A348135 5: [1, 5] %e A348135 6: [1, 2, 3, 6] %e A348135 7: [1, 3, 7] %e A348135 8: [1, 2, 4, 8] %e A348135 9: [1, 9] %e A348135 10: [1, 2, 5, 10] %e A348135 11: [1, 11] %e A348135 12: [1, 2, 3, 4, 6, 12] %e A348135 13: [1, 13] %e A348135 14: [1, 2, 3, 6, 7, 14] %e A348135 15: [1, 3, 5, 7, 15] %e A348135 16: [1, 2, 4, 8, 16] %o A348135 (PARI) See Links section. %Y A348135 Cf. A067138, A067399, A346795. %K A348135 nonn,tabf %O A348135 1,3 %A A348135 _Rémy Sigrist_, Oct 02 2021