Search: id:A081653
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%I A081653
%S A081653 1,1,1,1,1,2,1,2,1,1,2,1,1,1,1,1,2,1,1,2,1,4,1,1,1,2,1,2,1,1,2,5,1,1,2,
%T A081653 1,1,1,2,1,1,2,1,1,1,1,1,1,1,1,2,7,1,1,2,11,1,1,2,1,1,2,1,5,1,1,1,1,1,
               1,
%U A081653 1,1,2,1,1,1,2,1,1,1,1,1,1,2,1,1,1,16,1,1,1,1,1,1,2,1,2,1,2,1,2,1,2,5,
               1
%N A081653 Greatest common divisor of sums of decimal digits of n and of n-th prime.
%C A081653 a(n) = GCD(A007953(n), A007605(n)).
%e A081653 a(8) = GCD(A007953(8), A007953(A000040(8)) = GCD(8, A007953(19)) = GCD(8,
               1+9) = GCD(4*2,5*2) = 2.
%Y A081653 Cf. A000040, A081652, A066750.
%Y A081653 Sequence in context: A061916 A076348 A113310 this_sequence A096860 A128185 
               A022300
%Y A081653 Adjacent sequences: A081650 A081651 A081652 this_sequence A081654 A081655 
               A081656
%K A081653 nonn,base
%O A081653 1,6
%A A081653 Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Mar 25 2003

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