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Indices k such that k divides A007468(k).
4

%I #21 Jan 24 2020 03:37:18

%S 1,2,4,6,8,10,38,47,86,108,122,322,345,446,556,665,756,1122,1476,4838,

%T 6274,10556,12383,38774,42776,46239,210215,232276,517144,1125321,

%U 2561652

%N Indices k such that k divides A007468(k).

%o (PARI) { p=2 ; i=1 ; for(j=1,13000, psum=p ; for(k=2,j, p=nextprime(p+1) ; psum += p ; ) ; if(psum % j ==0, print(j) ; ) ; p=nextprime(p+1) ; ) ; } \\ _R. J. Mathar_, Jan 24 2008

%Y Cf. A134245, A134246.

%K nonn,more

%O 1,2

%A _Enoch Haga_, Oct 15 2007, Oct 16 2007

%E Better definition from _R. J. Mathar_, Nov 16 2007

%E Entries checked by R. J. Mathar, Jan 24 2008

%E a(24)-a(26) from _Max Alekseyev_, Jul 29 2011

%E a(27)-a(28) from _Chai Wah Wu_, Jan 14 2020

%E a(29) from _Chai Wah Wu_, Jan 16 2020

%E a(30)-a(31) from _Giovanni Resta_, Jan 24 2020