_Antti Karttunen (His-Firstname.His-Surname(AT)gmail.com), _, Sep 19 2009

OEIS Server: https://oeis.org/edit/global/881

The positions i where A163355(i) = i, that is, the fixed points of permutation A163355.

0, 1, 16, 20, 21, 256, 260, 261, 320, 321, 336, 340, 341, 4096, 4100, 4101, 4160, 4161, 4176, 4180, 4181, 5120, 5121, 5136, 5140, 5141, 5376, 5380, 5381, 5440, 5441, 5456, 5460, 5461, 65536, 65540, 65541, 65600, 65601, 65616, 65620, 65621

0,3

Alternatively, the positions of zeros in A163900.

a(n) = A000695(A165404(n)). Same sequence in base-4: A165406. See also A163902, A163903, A163910.

nonn

Antti Karttunen (His-Firstname.His-Surname(AT)gmail.com), Sep 19 2009

approved