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This question already has an answer here:

I'm looking to run a job at these very specific times.

Can this even be done in one expression?

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marked as duplicate by mdpc, Wesley, Jenny D, Belmin Fernandez, TheCleaner May 21 '13 at 14:12

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

This type of question has been frequently asked and answered, can I suggest that before asking the question, you look into the archives just a tinnie bit more? – mdpc May 21 '13 at 2:55
up vote 7 down vote accepted

You'd need two expressions to deal with the start on the half hour:

30-55/5 1 * * *     user    command
*/5 2-5 * * *       user    command
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