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 A083748 #5 Dec 15 2017 17:36:20 %S A083748 1,37,73,433,15301,39853,66781,78661,110161,146953,156493,202033, %T A083748 220033,305101,355753,416593,509833,593461,805933,1011061,1503001, %U A083748 1563661,2952613,4000033,4019653,4609513,5262193,6211837,6359221,6608701 %N A083748 Star numbers (A003154) whose digital sum and product of nonzero digits are both triangular numbers. %e A083748 a(2)=37 because %e A083748 ........()........ %e A083748 .......()()....... %e A083748 ..()()()()()()().. %e A083748 ...()()()()()()... %e A083748 ....()()()()().... %e A083748 ...()()()()()()... %e A083748 ..()()()()()()().. %e A083748 .......()()....... %e A083748 ........()........ %e A083748 and 3+7 is %e A083748 ....().... %e A083748 ...()()... %e A083748 ..()()().. %e A083748 .()()()(). %e A083748 and 3*7 is %e A083748 ......()...... %e A083748 .....()()..... %e A083748 ....()()().... %e A083748 ...()()()()... %e A083748 ..()()()()().. %e A083748 .()()()()()(). %K A083748 base,nonn %O A083748 1,2 %A A083748 _Jason Earls_, Jun 17 2003