%I
%S 31,32,73,79,80,81,83,84,109,111,112,118,139,140,174,175,176,181,183,
%T 184,186,190,205,273,277,281,301,313,317,319,320,322,433,454,482,485,
%U 486,489,490,493,497,502,505,511,512,513,618,622,643,644,699,700,703,704,706
%N Solutions to the equation M(n) = 4 (M = Mertens's function A002321).
%H Seiichi Manyama, <a href="/A171235/b171235.txt">Table of n, a(n) for n = 1..10000</a>
%Y Cf. A002321.
%K nonn
%O 1,1
%A Neven Juric (neven.juric(AT)apisit.hr), Sep 03 2010
%E More terms from _Seiichi Manyama_, Jan 04 2019
