A348160 Odd numbers not appearing in A348158.

189, 273, 315, 513, 567, 585, 825, 945, 1071, 1323, 1365, 1539, 1575, 1701, 1755, 1911, 2079, 2205, 2255, 2457, 2565, 2835, 3003, 3069, 3075, 3213, 3465, 3549, 3591, 3969, 4125, 4329, 4347, 4617, 4641, 4725, 4995, 5103, 5187, 5265, 5425, 5481, 5733, 5775, 5859, 5985

Offset: 1

Author

Amiram Eldar, Oct 03 2021

Keywords

• nonn

Comments

a(19) = 2255 is the least term that is not divisible by 3.

Crossrefs

Cf. A348158.

Similar sequences: A005114, A005277.

Programs

Mathematica

f[n_] := Plus @@ DeleteDuplicates @ Map[EulerPhi, Divisors[n]]; m = 6000; Complement[Range[1, m, 2], Array[f, m^2]]