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%I #14 Nov 20 2017 09:39:29
%S 3,4,6,10,15,16,22,26,27,28,35,36,38,41,57,59,60,62,63,64,66,69,87,88,
%T 91,92,102,123,124,125,126,129,134,135,136,143,144,151,152,153,155,
%U 156,158,165,167,168,169,210,213
%N Solutions to the equation M(n) = -1 (M = Mertens's function A002321).
%H Seiichi Manyama, <a href="/A171096/b171096.txt">Table of n, a(n) for n = 1..10000</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/MertensFunction.html">Mertens Function</a>
%o (PARI) isok(n) = sum(k=1, n, moebius(k)) == -1; \\ _Michel Marcus_, Nov 20 2017
%Y Cf. A028442, A118684.
%K nonn
%O 1,1
%A Neven Juric (neven.juric(AT)apis-it.hr), Sep 10 2010
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