%I A063938
%S A063938 1,2,3,4,5,6,7,8,9,10,12,14,15,16,18,20,21,24,25,27,28,30,32,35,36,40,
%T A063938 42,45,48,49,50,54,56,60,63,64,70,72,75,80,81,84,88,90,91,92,96,98,100,
%U A063938 105,108,112,115,120,125,126,128,135,140,144,147,150,160,161,162,168
%N A063938 Numbers n such that n divides tau(n), where tau(n)=A000594(n) is Ramanujan's 
               tau function.
%C A063938 Although most small numbers are in the sequence, it becomes sparser for 
               larger values; e.g. only 504 numbers up to 10000 and only 184 numbers 
               from 10001 to 20000 are in the sequence.
%H A063938 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               TauFunction.html">Link to a section of The World of Mathematics.</
               a>
%t A063938 (* First do <<NumberTheory`Ramanujan` *) test[n_] := Mod[RamanujanTau[n], 
               n]==0; Select[Range[200], test]
%Y A063938 For the sequence when n is prime see A007659. Cf. A063940, A000594, A079334.
%Y A063938 Sequence in context: A080672 A056757 A079333 this_sequence A002473 A161466 
               A117296
%Y A063938 Adjacent sequences: A063935 A063936 A063937 this_sequence A063939 A063940 
               A063941
%K A063938 nonn,easy
%O A063938 1,2
%A A063938 Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 31 2001
%E A063938 More terms from Dean Hickerson (dean.hickerson(AT)yahoo.com), Jan 03 
               2003