A172150 Smallest Fibonacci number divisible by 2^(2*n).

8, 144, 4807526976, 5972304273877744135569338397692020533504

Offset

1,1

Comments

The next term has 161 digits.

Links

Table of n, a(n) for n=1..4.

Example

f(12)=144=2^4*3^2,
f(48)=4807526976=2^6*3^2*7*23*47*1103,
f(192)=2^8*3^2*7*23*47*769*1087*1103*2207*..,
f(768)=2^10*3^2*7*23*47*127*383*..,..

Mathematica

lst={8}; k=12; Do[AppendTo[lst, Fibonacci[k]]; k*=4, {n, 5}]; lst

Crossrefs

Cf. A000045, A172145

Sequence in context: A111687 A231851 A071305 * A105046 A123812 A064331

Adjacent sequences: A172147 A172148 A172149 * A172151 A172152 A172153

Keyword

nonn

Author

Vladimir Joseph Stephan Orlovsky, Nov 19 2010

Status

approved