residues as of 2020-03-20 here (multi-megabyte file)

# 39547695 2221000 .. 2300000 - no primes

# 39547695 3400000 .. 3500000 - no primes

# 39547695 3500000 .. 3800000 - llr [paused on n=3670271]

# 39547695 3800000 .. 4000000 - sieving [paused]

# 193 2200000 .. ? - llr

# 195 3000000 .. ? - llr

# 197 3020000 .. ? - llr