The phrase "a number of sharp" is correct and usable in written English.
It can be used when referring to multiple items that are sharp in nature, such as tools, objects, or even ideas.
Example: "The toolbox contained a number of sharp knives, each designed for a specific purpose."
Alternatives: "several sharp" or "many sharp".
On Tuesday, Sanders parried a number of sharp questions from reporters, offering only vague responses.
On the way, the marines encountered a number of sharp battles and small, ill-organized attacks, mostly by militias loyal to the Iraqi president, Saddam Hussein.
A number of sharp B-related photoluminescence lines has been identified and found to vary considerably from one location to another.
The X-ray data also contain a number of sharp equatorial and off-equatorial Bragg maxima due to the presence of three-dimensional order.
He edited and contributed to a collection of stories in translation, The Book of Gaza (2014), and also published a number of sharp, moving essays about wartime Gaza last summer.
Mr. Bogosian's impersonations were generally far more impressive than his scripts, but the overall concept became clearer and stronger as the performance unfolded, finally revealing a number of sharp social insights in its seemingly scattershot ramblings.
At a number of occasions sharp gradients in the magnetic field were observed by the satellite.
As reported previously, the PXRD profile of Dac presented a number of distinctive sharp peaks.
Local guerillas came to the woman's aid and brought her to a hospital where a surgeon found a number of extremely sharp, three centimeter long "pins" inside her body.
A number of these sharp-edged representatives have then moved tothe Senate, where they have helped widen the partisan gulf we have talked about  and now can see.
A number of these sharp-edged representatives have then moved to the Senate, where they have helped widen the partisan gulf we have talked about and now can see.
