Is there a time paradox, where your future self, who won the lottery, travels back in time to tell you the numbers he picked to win?

Which he got from his future self, and so on.
Is this a simple causal loop, or is the infinite loop itself a paradox?
Is it equivalent to the paradox, where a time-traveller gifts all of Shakespeares’ works to Shakespeare, before he wrote them, raising the question ‘who originally wrote Shakespeare’s works?’