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 A087093 #19 Dec 30 2020 04:11:27 %S A087093 24,42,264,288,462,658,856,882,1071,1128,1314,1464,1701,2058,2130, %T A087093 2132,2312,2324,2424,2510,2590,2616,2664,2744,2765,2782,2786,2872, %U A087093 2904,2938,2975,3159,3194,4010,4090,4092,4094,4125,4131,4136,4168,4184,4220,4228 %N A087093 Numbers that have the same number of divisors as their digit reversal, but with different prime signatures. %C A087093 Terms in A062895 but not in A085869. %H A087093 Amiram Eldar, <a href="/A087093/b087093.txt">Table of n, a(n) for n = 1..10000</a> %e A087093 24 and 42 are members as 24 and 42 each have 8 divisors but with different prime signatures. %t A087093 psQ[n_]:=Sort[Transpose[FactorInteger[n]][[2]]]!=Sort[Transpose[ FactorInteger[FromDigits[Reverse[IntegerDigits[n]]]]][[2]]];ndQ[n_]:= DivisorSigma[0,n]==DivisorSigma[0,FromDigits[Reverse[ IntegerDigits[ n]]]]; Select[Range[5000],psQ[#]&&ndQ[#]&] (* _Harvey P. Dale_, Nov 11 2011 *) %Y A087093 Cf. A000005, A062895, A085869, A085870. %K A087093 nonn,base %O A087093 1,1 %A A087093 _Ray Chandler_, Aug 09 2003