This was unexpected, after 440 CPU days found a new lower bound for D(48,10)
This is the reason why I'm not trying to find minimal chains. D(48.23) was found faster than your D(48.10)

Код:
3060278483597425530008549154579391746768732459946324087982095788737108148442588152975844860866349052906425781245
И вновь все 7 чисел факторизуются без затруднений (All 7 numbers are factorized quickly).