s = 0 unseen = 1 seen(v) = bit test(s, v) see(v) = s = bit or(s, 2^v); while (seen(unseen), unseen++) ok(p,v) = { my (d=digits(v), t=p%10, w=t%2); for (k=1, #d, if (w && d[k]<=t, return (0), w=(t=d[k])%2 ); ); return (1); } other(p) = { see(p); for (v=unseen, oo, if (!seen(v), if (v%10==9, see(v), !ok(0,v), see(v) ); if (!seen(v) && ok(p,v), return (v); ); ); ); } for (n=1, 10 000, print (n " " v=if (n==1, 0, other(v)))) quit