%N Numbers n whose trajectory under the map k -> (psi(k)+phi(k))/2 (A291784) grows without limit.
%C See A291787 (where A291787(m) = 2*A291787(m-7) for m >= 35) for the trajectory of 45.
%C There is a similar proof that all the terms from 48 though 152 have a trajectory that merges with the trajectory of 45, and so doubles every 7 steps after a certain point. For example, the trajectory of 152 reaches 2^106*33 at step 390, is 2^107*33 at step 397, and thereafter doubles every 7 steps.- _N. J. A. Sloane_, Sep 24 2017
%Y Cf. A291784, A291785, A291786, A291787.
%A _N. J. A. Sloane_, Sep 03 2017, based on data supplied by _Hans Havermann_.
%E Terms 104 to 152 added by _N. J. A. Sloane_, Sep 24 2017