A348995 Positions of ones in A347084, which is the Dirichlet inverse of (n + arithmetic derivative of n).

1, 4, 8, 9, 16, 25, 32, 49, 64, 121, 128, 169, 256, 289, 361, 512, 529, 841, 961, 1024, 1369, 1536, 1681, 1849, 2048, 2209, 2809, 3481, 3721, 4096, 4489, 5041, 5329, 6241, 6889, 7921, 8192, 9409, 10201, 10240, 10609, 11449, 11881, 12769, 14080, 16129, 16384, 17161, 18769, 19321, 22201, 22801, 24649, 26569, 27889

Offset: 1

Author

Antti Karttunen, Nov 14 2021

Keywords

• nonn

Comments

The only terms in range 1 .. 2^20 that are not powers of primes are: 1536, 10240, 14080, 57344, 58880, 142848, 396800, 444416, 777728.

Crossrefs

Cf. A003415, A129283, A347084.