Please recommend a prescaler

Your question is not well specified. Divide ratios are not fractional it is only 3 modulus divider binary related. Please specify your requirements and do you looking for synth, chip or separate divider chip?

XTASA

http://products.zarlink.com/product_profiles/SP8402.htm

This one is cheap (NTE is former ECG)
http://www.nteinc.com/specs/800to899/NTE851.html
regards

check with hittite website they have a lot of cheap prescaler