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A064623
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Primitive subsequence of A066031: terms of A066031 which are not a multiple of some previous terms.
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3
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30, 70, 84, 105, 231, 234, 260, 286, 456, 528, 532, 627, 646, 805, 897, 1116, 1122, 1275, 1364, 1581, 1665, 1798, 1924, 2064, 2150, 2275, 2565, 2632, 2958, 2967, 3055, 3213, 3339, 3526, 3861, 4070, 4543, 4824, 5025, 5152, 5487, 5658, 5840, 6164, 6461
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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a = {30}; Do[ If[ IntegerQ[ n / Apply[ Plus, First[ Transpose[ FactorInteger[n]]]]] && Mod[ n, n - EulerPhi[n]] != 0 && First[ Union[ Mod[n, a]]] != 0, a = Append[a, n]], {n, 1, 10000} ]; a
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PROG
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(PARI) f(n)=my(f=factor(n)[, 1]); #f[, 1]>1 && n%sum(i=1, #f, f[i])==0
list(lim)=my(v=List(), p=2); forprime(q=p+1, nextprime(lim), for(n=p+1, q-1, if(f(n), for(i=1, #v, if(n%v[i]==0, next(2))); listput(v, n))); p=q); Vec(v) \\ Charles R Greathouse IV, Sep 08 2012
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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