137321domain: NPropertiesPrimalityPrimeyesAppears in sequencesBalanced primes separated from the next lower and next higher prime neighbors by 18.at n=30A053073Let P(k) = floor(k/2). Start with n, apply P repeatedly until reach 1. a(n) = concatenation of numbers obtained.at n=25A083177Primes with eleven embedded primes.at n=16A179919Prime numbersat n=12784