Search: id:A117430
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%I A117430
%S A117430 3,1,0,2,1,2,2,2,2,3,2,2,2,4,4,2,8,6,2,3,2
%V A117430 3,-1,0,-2,1,2,-2,-2,-2,-3,2,2,-2,-4,4,2,-8,-6,-2,-3,-2
%N A117430 Integer k such that 5^n + k = A117429(n).
%C A117430 Distance from 5^n to the nearest semiprime. See also: A117416 Semiprime 
               nearest to 3^n. A117405 Semiprime nearest to 2^n. A117387 Prime nearest 
               to 2^n.
%F A117430 a(n) = Integer k such that 5^n + k = A117429(n). a(n) = A117429(n) - 
               5^n. a(n) = Min{k such that A001358(i) + k = 5^n}.
%e A117430 a(0) = 3 because 5^0 + 3 = 4 = A001358(1) and no semiprime is closer 
               to 5^0.
%e A117430 a(1) = -1 because 5^1 - 1 = 4 = A001358(1) and no semiprime is closer 
               to 5^1.
%e A117430 a(2) = 0 because 5^2 + 0 = 25 = A001358(9), no semiprime is closer to 
               5^2 [this is the only 0 element].
%e A117430 a(3) = -2 because 5^3 - 2 = 123 = 3 * 41 = A00135842), no semiprime is 
               closer.
%e A117430 a(4) = 1 because 5^4 + 1 = 626 = 2 * 313, no semiprime is closer.
%e A117430 a(5) = 2 because 5^5 + 2 = 3127 = 53 * 59, no semiprime is closer.
%Y A117430 Cf. A000079, A001358, A117387, A117405, A117406, A117416, A117429.
%Y A117430 Sequence in context: A166408 A128618 A101548 this_sequence A143676 A002726 
               A119734
%Y A117430 Adjacent sequences: A117427 A117428 A117429 this_sequence A117431 A117432 
               A117433
%K A117430 easy,sign,less
%O A117430 0,1
%A A117430 Jonathan Vos Post (jvospost3(AT)gmail.com), Mar 14 2006

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