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 A082776 #14 Mar 07 2021 01:08:55 %S A082776 1,11,121,12221,12233221,122344443221,15223441414432251, %T A082776 15223441429655692414432251 %N A082776 a(1) = 1, a(n) = smallest palindromic multiple of a(n-1) obtained by inserting digits anywhere in a(n-1). %C A082776 a(n)<=(10^A055642(a(n-1))+1)*a(n-1). If a(n-1) > 10 and the last digit of a(n-1) <= 4, then a(n)<=(10^(A055642(a(n-1))-1)+1)*a(n-1). - _Chai Wah Wu_, Mar 06 2021 %Y A082776 Cf. A055642, A082777, A082778, A082779, A082780. %K A082776 base,nonn,more %O A082776 1,2 %A A082776 _Amarnath Murthy_, Apr 19 2003 %E A082776 Corrected by _Ray Chandler_, Oct 13 2003 %E A082776 a(8) from _Sean A. Irvine_, Apr 19 2010