Search: id:A103176
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%I A103176
%S A103176 3,19,43,113,463,619,863,1789,2273,2383,4519,4789,4937,5443,5507,5653,
%T A103176 8237,10459,13007,13697,16063,16453,17389,18313,18919,20903,21193,21319,
%U A103176 21383,23567,24109,25309,26267,27947,28283,29573,30559,31183,31517
%N A103176 Prime with subscript=sigma(n), if p[sigma(n)]-p[phi(n)]=A067161(n)-A048848(n)=6, 
               where p(j)=j-th prime.
%C A103176 Conjectured: In all cases sigma(n)-phi(n)=2, i.e. n is a prime number.
%e A103176 n=3719,sigma[n]=3720,phi(n)=3718, a(n)=p[sigma(n)]=34847.
%p A103176 Do[g=n;a=Prime[u=DivisorSigma[1,n]]; b=Prime[w=EulerPhi[n]];s=a-b; If[Equal[s,
               6],Print[{n,a,b,u,w,u-w}]; ta=Append[ta,a]],{n,1,10000}] ta=Delete[ta,
               1]
%Y A103176 Cf. A067161, A048848, A000020, A000203.
%Y A103176 Sequence in context: A103145 A100694 A146664 this_sequence A028880 A162905 
               A063553
%Y A103176 Adjacent sequences: A103173 A103174 A103175 this_sequence A103177 A103178 
               A103179
%K A103176 nonn,uned
%O A103176 1,1
%A A103176 Labos E. (labos(AT)ana.sote.hu), Mar 02 2005

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