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 A202266 #7 Mar 30 2012 19:00:28 %S A202266 4,6,8,9,44,46,48,49,64,66,68,69,84,86,88,94,96,99,444,446,448,464, %T A202266 466,468,469,484,486,488,494,496,644,646,648,649,664,666,668,669,684, %U A202266 686,688,694,696,699,844,846,848,849,864,866,868,869,884,886,888,946,948 %N A202266 Composite numbers in which all substrings and reversal substrings are composites. %C A202266 Subsequence of A202265, A202262. %e A202266 All substrings and reversal substrings of 446 are composites: 4, 6, 44, 46, 64, 446, 644. %Y A202266 Cf. A202263 (primes in which all substrings and reversal substrings are primes), A202264 (noncomposite numbers in which all substrings and reversal substrings are noncomposite), A202265 (nonprimes in which all substrings and reversal substrings are nonprimes). %K A202266 nonn,base %O A202266 1,1 %A A202266 _Jaroslav Krizek_, Dec 25 2011