there are

51,61,71,81,91,101,111,121,131,141,151,

161,171,181,191,201,211,221,231,241,251,

261,271,281,291,301,311,321,331,341.

so, 51,61,71,81,91,101,111,121,131,141,151,161,

171,181,191,201,211,221,231,241,251,

261,271,281,291,301,311,321,331,341 add all together.

The result is 5880