Taking 493-494.

John completed 473-475, one prime: 135 474178.

491-492 complete, no primes.

Taking 494-495.

490-491 and 493-494 complete, no primes.

Taking 495-496.

469-470 complete, no primes.

Taking 496-497.

495-496 complete.

Taking 497-498.

492-493 complete, no primes.

Taking 498-499.

I just put on server files in the 500-520 range sieved to 6174bn.

We are using again mersenneforum.org server bacuase currently I cannot ftp to 15k.org server (but http works).

494-495 complete, no primes.

Taking 499-500.

497-498 complete, no primes.

Taking 500-501.

498-499 complete, no primes.

Taking 501-502.