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 A376706 #10 Oct 03 2024 08:31:32 %S A376706 90,875,2401,99671,999973,9991291,88529281,999997283,9999998329, %T A376706 99999997711,988053892081,9999999999809,99999999988979, %U A376706 999999999991541,9892436613211441,99999999999805729,999999999999968753,9999999999999834493,99964004859708406561,999999999999999959833 %N A376706 a(n) = largest 4-brilliant number (A376704) with n decimal digits. %C A376706 See Alpern link for more terms, along with their prime factorization. %H A376706 Dario Alpern, <a href="https://www.alpertron.com.ar/BRILLIANT4.HTM">4-Brilliant Numbers</a>. %e A376706 a(6) = 999973 because 999973 = 13 * 13 * 61 * 97 is the largest 6-digit number with four prime factors having the same number of digits. %Y A376706 Subsequence of A376704. %Y A376706 Cf. A078972, A083182, A376703, A376705. %K A376706 nonn,base %O A376706 2,1 %A A376706 _Paolo Xausa_, Oct 02 2024