k=121 Prime Search
Starting Lucas Lehmer Riesel prime test of 121*2^6586917-1
Using AVX FFT length 400K, Pass1=320, Pass2=1280
Iter: 2088857/6586916, ERROR: ROUND OFF (0.40625) > 0.4
Continuing from last save file.
Resuming LLR test of 121*2^6586917-1 at iteration 2044033 [31.03%]
Disregard last error.  Result is reproducible and thus not a hardware problem.
For added safety, redoing iteration using a slower, more reliable method.
Continuing from last save file.
Resuming LLR test of 121*2^6586917-1 at iteration 2088857 [31.71%]
121*2^6586917-1, iteration : 2180000 / 6586917 [33.09%].  Time per iteration : 4.564 ms..