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A060848 Difference between a nontrivial prime power (A025475) and the next prime. 0


%S 1,3,2,1,4,2,5,4,3,2,6,2,3,4,8,1,4,4,6,9,12,6,4,12,6,7,30,4,12,12,5,

%T 16,6,4,10,10,12,10,6,3,4,6,10,4,6,2,4,10,6,17,4,10,4,18,6,30,12,12,4,

%U 10,27,4,6,4,12,4,28,6,2,10,4,4,10,12,18,10,10,3,12,4,12,6,10,10,18,10,12

%N Difference between a nontrivial prime power (A025475) and the next prime.

%F a(n)=nextprime[A025475(n)]-A025475(n)=A013632[A025475(n)]

%e 78125=5^7 is followed by 78137, the difference is 12; a(n)=1 only for some powers of 2.

%Y Cf. A025475, A000961, A001597, A001694, A007917, A007918, A013632, A013633, A049711.

%K nonn

%O 1,2

%A _Labos Elemer_, May 03 2001

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Last modified January 23 10:45 EST 2020. Contains 331171 sequences. (Running on oeis4.)