%I #5 Mar 24 2018 17:18:30
%S 3,2,1,0,1,2,1,0,0,1,2,3,3,2,1,0,1,2,3,4,4,3,2,1,0,1,0,1,2,2,1,0,1,2,
%T 3,4,5,6,7,8,8,7,6,5,4,3,2,1,0,1,2,3,4,5,6,7,7,6,5,4,3,2,1,0,1,2,3,4,
%U 5,6,7,8,8,7,6,5,4,3,2,1,0,1,2,3,4
%N Smallest distance from n to a prime power (as defined in A246547).
%Y There are four different sequences which may legitimately be called "prime powers": A000961 (p^k, k >= 0), A246655 (p^k, k >= 1), A246547 (p^k, k >= 2), A025475 (p^k, k=0 and k >= 2).
%Y Cf. A061670, A080732, A301295.
%K nonn
%O 1,1
%A _N. J. A. Sloane_, Mar 24 2018