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 A338919 #13 Nov 18 2020 20:02:19 %S A338919 1,2,4,3,6,9,8,12,18,16,5,20,15,24,10,30,40,36,48,50,42,7,54,45,28,60, %T A338919 66,14,32,56,72,80,100,78,70,64,27,88,21,84,25,96,63,104,81,90,108, %U A338919 120,112,150,180,140,144,126,110,11,130,99,128,35,102,105,136,117,160,22 %N A338919 Square array of distinct positive integers T(n, k), n > 0, k > 0, read by antidiagonals upwards, filled the greedy way such that for any n > 0 and k > 0, T(n, k) is divisible by n and by k. %C A338919 All integers appear in this sequence. %H A338919 Rémy Sigrist, <a href="/A338919/b338919.txt">Table of n, a(n) for n = 1..5050</a> %H A338919 Rémy Sigrist, <a href="/A338919/a338919.gp.txt">PARI program for A338919</a> %H A338919 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %F A338919 T(p, 1) = p for any prime number p. %e A338919 Array T(n, k) begins: %e A338919 n\k| 1 2 3 4 5 6 7 8 9 10 %e A338919 ---+------------------------------------------------- %e A338919 1| 1 4 9 16 10 42 14 64 81 110 %e A338919 2| 2 6 18 24 50 66 70 104 126 160 %e A338919 3| 3 12 15 48 60 78 63 144 117 270 %e A338919 4| 8 20 36 28 100 96 140 136 288 260 %e A338919 5| 5 40 45 80 25 180 105 240 225 190 %e A338919 6| 30 54 72 84 150 102 252 312 198 360 %e A338919 7| 7 56 21 112 35 168 49 280 315 490 %e A338919 8| 32 88 120 128 200 264 224 152 504 400 %e A338919 9| 27 108 99 216 135 162 189 432 153 720 %e A338919 10| 90 130 210 220 170 330 350 320 630 230 %o A338919 (PARI) See Links section. %Y A338919 See A338872 and A338918 for similar sequences. %K A338919 nonn,look,tabl %O A338919 1,2 %A A338919 _Rémy Sigrist_, Nov 15 2020