# via Yousuke Koide
n=271: c263(1211517264......) = 4790817014835738008638872886922952208975172696533 * c214(2528832264......)
n=397: c342(1680860126......) = 306705064286388936780828266137942480452220517447677 * c291(5480379432......)
# GMP-ECM
n=753: c449(3748480563......) = 45316978862713868577793720892923 * c417(8271691224......)
# GMP-ECM
# via Yousuke Koide
n=1460M: c233(5564408475......) = 4941698957237831273165154533595725287181 * p194(1126011220......)
# GMP-ECM
n=515: c334(2020904425......) = 7073532436575439739956079653594194521 * c297(2856994639......)
# GMP-ECM