283007domain: NPropertiesPrimalityPrimeyesAppears in sequencesLargest prime factor of 2^n-3.at n=34A093817A006530(x)=2 is a local minimum if x=2^n. Running downward with argument x started at 2^n, the largest prime divisor should increase. The value of first peak is a(n).at n=35A102644Primes in A153257.at n=19A140719Prime numbersat n=24683