152093domain: NPropertiesPrimalityPrimeyesAppears in sequencesPrimes of the form k^2 - 7.at n=33A028883Trajectory of 1 under map n->21n+1 if n odd, n->n/2 if n even.at n=26A033967Trajectory of 3 under map n->21*n+1 if n odd, n->n/2 if n even.at n=33A037108Prime numbersat n=14034