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 A030985 #25 Feb 16 2025 08:32:35 %S A030985 2,92,792,9792,69792,369792,2369792,62369792,262369792,7262369792, %T A030985 27262369792,27262369792,27262369792,80027262369792,580027262369792, %U A030985 4580027262369792,14580027262369792,914580027262369792 %N A030985 3-automorphic numbers ending in 2: final digits of 3*n^2 agree with n. %C A030985 a(n) is the unique positive integer less than 10^n such that a(n) is divisible by 2^n and 3*a(n) - 1 is divisible by 5^n. - _Eric M. Schmidt_, Aug 18 2012 %H A030985 Eric M. Schmidt, <a href="/A030985/b030985.txt">Table of n, a(n) for n = 1..1000</a> %H A030985 <a href="/index/Ar#automorphic">Index entries for sequences related to automorphic numbers</a> %H A030985 <a href="/index/Fi#final">Index entries for sequences related to final digits of numbers</a> %H A030985 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/AutomorphicNumber.html">Automorphic Number</a> %o A030985 (Sage) [crt(0, inverse_mod(3, 5^n), 2^n, 5^n) for n in range(1, 1001)] # _Eric M. Schmidt_, Aug 18 2012 %K A030985 nonn,base %O A030985 1,1 %A A030985 _Eric W. Weisstein_