| - n=700k-1M, 11k left (522, 816, 1614, 2148, 2640, 3972, 4428, 5910, 6752, 7088, 7352)- runtime 2h08min-4h38min (AVX @3.8Ghz)
 - 45729 WUs
 
 284*37^128864-1 found by Lennart SM5YMT
 6792*37^181029-1 found by Ralfy
 5376*37^289738-1 found by Fernando Miguel (TOP5000)
 4806*37^364466-1 found by bcavnaugh (TOP5000)
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