A348995 - OEIS

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

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OFFSET

1,2

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.

LINKS

Table of n, a(n) for n=1..55.

CROSSREFS

Cf. A003415, A129283, A347084.

Sequence in context: A353485 A371010 A067252 * A324723 A355580 A272758

Adjacent sequences: A348992 A348993 A348994 * A348996 A348997 A348998

KEYWORD

nonn

AUTHOR

Antti Karttunen, Nov 14 2021

STATUS

approved