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 A046330 #12 Jul 07 2024 18:47:39 %S A046330 88,232,414,424,444,484,525,585,636,666,676,686,808,858,868,999,1881, %T A046330 2002,2332,2442,2662,3003,3663,3773,3993,4114,4444,4774,5005,5115, %U A046330 5225,6116,6556,6666,7007,7227,8668,9999,10101,10701,11011,12321,13431 %N A046330 Palindromes with exactly 4 prime factors (counted with multiplicity). %H A046330 John Cerkan, <a href="/A046330/b046330.txt">Table of n, a(n) for n = 1..10000</a> %t A046330 Select[Range[14000],PalindromeQ[#]&&PrimeOmega[#]==4&] (* _Harvey P. Dale_, Jul 07 2024 *) %Y A046330 Cf. A014613, A046317, A046410. %K A046330 nonn,base %O A046330 1,1 %A A046330 _Patrick De Geest_, Jun 15 1998