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 A348160 #7 Oct 04 2021 23:51:58 %S A348160 189,273,315,513,567,585,825,945,1071,1323,1365,1539,1575,1701,1755, %T A348160 1911,2079,2205,2255,2457,2565,2835,3003,3069,3075,3213,3465,3549, %U A348160 3591,3969,4125,4329,4347,4617,4641,4725,4995,5103,5187,5265,5425,5481,5733,5775,5859,5985 %N A348160 Odd numbers not appearing in A348158. %C A348160 a(19) = 2255 is the least term that is not divisible by 3. %t A348160 f[n_] := Plus @@ DeleteDuplicates @ Map[EulerPhi, Divisors[n]]; m = 6000; Complement[Range[1, m, 2], Array[f, m^2]] %Y A348160 Cf. A348158. %Y A348160 Similar sequences: A005114, A005277. %K A348160 nonn %O A348160 1,1 %A A348160 _Amiram Eldar_, Oct 03 2021