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Smallest distance from n to a prime power (as defined in A246547).
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%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