7672913domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(0) = 1; thereafter a(n) = 2^(prime(n)-1) + Sum_{k=1..n} 2^(prime(n)-prime(k)).at n=9A333392Primes whose binary representation corresponds to the characteristic function of 1, 2, 3, 5, 7, ... (1 followed by primes).at n=4A333393Prime numbersat n=519192