138799domain: NPropertiesPrimalityPrimeyesAppears in sequencesSequence of coefficients arising in connection with a rapidly converging series for Pi.at n=4A005148a(n) = A005148(n)/8^(b(n)-1) where b(n) denotes the number of 1's in the binary representation of n.at n=3A074774Prime numbersat n=12911