WASHINGTON – Average rates on fixed mortgages rose this week, the first increase in seven weeks. But mortgage rates remain near historic lows, boosting prospects for home sales this year.

Mortgage buyer Freddie Mac said Thursday that the average rate on the 30-year loan increased to 3.71 percent. That's up from 3.67 percent last week, the lowest since long-term mortgages began in the 1950s.

The average rate on the 15-year mortgage, a popular refinancing option, rose to 2.98 percent. That's up from 2.94 percent last week, also a record low.