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 A202265 #14 Jul 30 2024 12:41:33
%S A202265 0,1,4,6,8,9,10,18,40,44,46,48,49,60,64,66,68,69,80,81,84,86,88,90,94,
%T A202265 96,99,100,108,180,184,186,400,404,406,408,440,444,446,448,460,464,
%U A202265 466,468,469,480,481,484,486,488,490,494,496,600,604,606,608,609
%N A202265 Nonprime numbers in which all substrings and reversal substrings are nonprimes.
%C A202265 Subsequence of A062115, A202259.
%C A202265 Supersequence of A202266.
%H A202265 Harvey P. Dale, <a href="/A202265/b202265.txt">Table of n, a(n) for n = 1..2000</a>
%e A202265 All substrings and reversal substrings of 186 are nonprimes: 1, 6, 8, 18, 68, 81, 86, 186, 681.
%t A202265 Select[Range[0,1000],NoneTrue[Union[Flatten[{#,IntegerReverse[#]}&/@Flatten[Table[ FromDigits/@Partition[IntegerDigits[#],d,1],{d,IntegerLength[#]}]]]],PrimeQ]&] (* _Harvey P. Dale_, Jul 30 2024 *)
%Y A202265 Cf. A202263 (primes in which all substrings and reversal substrings are primes), A068669 (noncomposite numbers in which all substrings and reversal substrings are noncomposites), A202266 (composite numbers in which all substrings and reversal substrings are composites).
%K A202265 nonn,base
%O A202265 1,3
%A A202265 _Jaroslav Krizek_, Dec 25 2011
%E A202265 Corrected (498 deleted) by _Harvey P. Dale_, Jul 30 2024