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 A075131 #3 Mar 31 2012 10:26:43 %S A075131 7980062073,79862699373,798006269373,7986207926373,79862079269373, %T A075131 798062073062073,798620736269373,7980000620792073,7980006269999373, %U A075131 7980620730626373,7980626373062073,7980626379269373,7986207306269373 %N A075131 Picture-perfect numbers of form 57*p for p in A075130. The decimal reversal is equal to the sum of the reversed proper divisors. %C A075131 All known picture-perfect numbers are of this form, except the first 4 in A069942. - _Jens Kruse Andersen_, May 06 2008 %H A075131 Discussion forum, <a href="http://disc.server.com/Indices/187886.html">Systematic Undertaking to Find Picture-Perfect Numbers</a> %H A075131 Joseph Pe, <a href="http://jlpe.tripod.com/ppn/ppnpaper.htm">Picture-Perfect Numbers and Other Digit-Reversal Diversions</a> %e A075131 a(4)=57*140108910989=7986207926373. %Y A075131 a(n) = 57*A075130(n) %Y A075131 Cf. A075130, A069942. %K A075131 base,nonn %O A075131 1,1 %A A075131 _Jens Kruse Andersen_, Sep 04 2002 %E A075131 Edited by _Jens Kruse Andersen_, May 06 2008