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%I #17 Dec 20 2021 02:37:33
%S 1,4,8,9,12,18,22,27,32,36,45,49,50,64,72,81,91,98,100,106,121,128,
%T 129,133,134,146,148,152,162,169,171,192,200,202,217,218,219,243,256,
%U 259,262,268,274,288,289,292,301,314,324,333,338,343,361,381,386,388
%N Nonprime numbers k such that value of sigma(k) is unique; sigma(k) = A000203(k) = sum of divisors of k.
%C Complement of A066076 with respect to A211656.
%H Amiram Eldar, <a href="/A211658/b211658.txt">Table of n, a(n) for n = 1..10000</a>
%e Number 36 is in the sequence because sigma(36) = 91 and there is no other number m with sigma(m) = 91.
%e Number 6 is not in the sequence because sigma(6) = 12 and 12 is also sigma(11).
%Y Cf. A000203, A066076, A211656, A211657, A211659, A211660.
%K nonn
%O 1,2
%A _Jaroslav Krizek_, Apr 20 2012