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 A288502 #10 Jun 12 2017 08:31:25 %S A288502 263,284,362,393,482,1262,1284,1293,1382,1393,1482,1493,1631,1823, %T A288502 1841,1932,1934,2162,2173,2184,2193,2194,2195,2346,2375,2593,2597, %U A288502 2612,2621,2625,2638,2658,2674,2713,2735,2813,2814,2831,2841,2843,2845,2847,2849,2859,2895,2914 %N A288502 Strings of digits from 1...9 such that any possible formula using the single digits in the given order that evaluates to 0 needs to include at least one division. %C A288502 For definitions see A288350. %H A288502 Hugo Pfoertner, <a href="/A288502/b288502.txt">Table of n, a(n) for n = 1..1009</a> %H A288502 Hugo Pfoertner, <a href="/A288502/a288502.txt">Formulas with result 0 for all sequence terms</a>. %e A288502 1262 is in the sequence, because no formula with result 0 avoiding divisions can be found, but 0=1+2-(6/2). A file with examples of formulas for all sequence terms is provided, see link section. %Y A288502 Cf. A288350, A288352. %K A288502 nonn,base,fini,full %O A288502 1,1 %A A288502 _Hugo Pfoertner_, Jun 10 2017