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Places n where A225867(n) <= 2.
2

%I #25 Nov 26 2014 10:16:42

%S 7,8,11,17,23,29,41,47,59,71,239,359,419,839

%N Places n where A225867(n) <= 2.

%C Except for a(2)=8, all terms are prime.

%C Is this sequence finite?

%C There are no other terms up to 86000. - _Peter J. C. Moses_, Jun 28 2013

%C There are no more terms up to 10^9. - _Charles R Greathouse IV_, Nov 25 2014

%o (PARI) is(n)=for(k=2,n\2-1,if(sumdiv(n+k,d,(n+d)%k==0 && d>1)>2, return(0))); n>6 \\ _Charles R Greathouse IV_, Nov 25 2014

%Y Cf. A225867, A049002.

%K nonn,more

%O 1,1

%A _Vladimir Shevelev_, Jun 27 2013