%I
%S 2,5,11,17,19,23,29,37,41,43,47,53,59,61,67,71,73,79,83,89,97,101,103,
%T 107,109,113,131,137,139,149,151,157,163,167,173,179,181,191,193,197,
%U 199,211,223,227,229,233,239,241,251,257,263,269,271,277,281,283,293
%N Primes p such that the equation sigma(x)=p has no solution.
%o (PARI) for(n=1,100,if(sum(j=1,n,if(sigma(j)n,1isprime(n),1))==0,print1(n,",")))
%Y Cf. A007369.
%K easy,nonn
%O 1,1
%A _Benoit Cloitre_, May 16 2002
