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 A085889 #21 Sep 19 2024 14:42:12 %S A085889 1,2,3,4,5,6,7,8,9,12,45,56,90,567,3456 %N A085889 7-smooth numbers (A002473) using digits in increasing order. 9 is followed by a zero. %C A085889 No more terms < 10^1000. Probably no more terms. - _David Wasserman_, Feb 10 2005 %e A085889 567 is a member as 567 = 3^4*7. %o A085889 (PARI) hcn(n) = while (!(n%2), n \=2); while (!(n%3), n \=3); while (!(n%5), n \=5); while (!(n%7), n \=7); n == 1; %o A085889 for (i = 0, 1000, for (j = 1, 9, my(n = sum(k = j, i + j, (k%10)*10^(i + j - k))); if (hcn(n), print1(n, ", ")))); /* _David Wasserman_, Feb 10 2005 */ %Y A085889 Intersection of A002473 and A059043. %Y A085889 Cf. A085890. %K A085889 base,nonn %O A085889 1,2 %A A085889 _Amarnath Murthy_ and Meenakshi Srikanth (menakan_s(AT)yahoo.com), Jul 10 2003 %E A085889 3456 from _David Wasserman_, Feb 10 2005