I can't say for sure with the information you have provided, but the given that the links you've listed are actual pages on your site, (and no apparent url manipulation for sql injection being passed), it doesn't look malicious. It is possible they are bot (which could be search engines, etc.) related. Can you post the complete, relevant lines from your log?.
Is "/p=741" still a page on your site? How many of these hits are you seeing? And out of how many hits in general.
If it really worries you, you can always install the Block Bad Queries (BBQ) plugin. I use it on all my WP sites.