A030275 Denominators of sequence {b(1), b(2),...} which when COMPOSED with itself gives {1,2,3,...}.

1, 1, 2, 4, 8, 1, 16, 64, 128, 128, 256, 512, 1024, 2048, 2048, 16384, 32768, 32768, 65536, 131072, 262144, 131072, 524288, 2097152, 4194304, 4194304, 8388608, 2097152, 16777216, 134217728, 67108864, 1073741824, 2147483648, 2147483648, 4294967296, 8589934592

Offset

1,3

Links

Table of n, a(n) for n=1..36.

N. J. A. Sloane, Transforms

Example

[ 1, 1, 1/2, 1/4, 1/8, 0, 1/16, 3/64, -29/128, 25/128, 263/256, -1481/512, -5493/1024, 80505/2048 ]

Crossrefs

Cf. A030274, A091138.

Sequence in context: A317495 A317504 A097888 * A097874 A097885 A097892

Adjacent sequences: A030272 A030273 A030274 * A030276 A030277 A030278

Keyword

nonn,frac

Author

N. J. A. Sloane.

Extensions

More terms from Vladeta Jovovic, Dec 19 2003

Status

approved