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 A363634 #8 Jul 15 2023 06:36:02 %S A363634 1,9,21,49,63,75,93,99,105,111,129,135,169,189,195,201,219,231,237, %T A363634 259,261,273,297,357,399,429,477,483,489,495,511,553,559,579,615,621, %U A363634 645,651,693,723,729,735,777,801,805,819,855,867,897,903,925,931,957,961 %N A363634 Lucky numbers that are products of smaller lucky numbers. %e A363634 1 is a term because it is a lucky number and equals the empty product. %e A363634 21 is a term because 21 = 3*7 and both 21 and the two factors 3 and 7 are lucky numbers. %e A363634 729 is a term because 729 = 9*9*9 and both 729 and 9 are lucky numbers. (This is the first term that requires more than two factors.) %Y A363634 Cf. A000959, A363635, A363636. %K A363634 nonn %O A363634 1,2 %A A363634 _Pontus von Brömssen_, Jun 19 2023