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 A204140 #10 Oct 30 2018 10:31:02 %S A204140 123456789,123678459,123875649,124563789,124789563,127593468, %T A204140 127638945,127648953,132487695,132596478,134526789,135246879, %U A204140 135926748,135947826,136245978,136597482,136758924,136875249,137645982,137689245,137826459,138752649,138795462,138976452 %N A204140 Numbers m such that both m and 7m are zeroless pandigital numbers (A050289). %C A204140 There are precisely 24 such numbers. %C A204140 The only number m such that m and 8m are zeroless pandigital numbers is A050289(1)=123456789. %F A204140 a(n) = A204141(n)/7. %Y A204140 Cf. A050289, A204141. %K A204140 nonn,base,fini,full %O A204140 1,1 %A A204140 _Zak Seidov_, Jan 11 2012