Numbers which are not a perfect power of a prime, and whose largest prime factor has exponent greater than 1. One can normally omit the largest factor when giving a prime factorization of a number, but here it is not clear what that means.
f(x)=local(m,s);m=factorint(x);s=matsize(m);if(s[1]==1,0,if(m[s[1],2]==1,0,1))
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