A228811 - OEIS

%I #12 Sep 26 2015 15:00:19

%S 11,43,11,11,121,11,11,1153,109,97,11,11,11,11,11,19,2909,6221,297889,

%T 3,3

%N GCD's arising in A228810.

%H Wikipedia, <a href="http://en.wikipedia.org/wiki/Greatest_common_divisor">Greatest common divisor</a>

%o (PARI) isA000430(n)=isprime(n) || (issquare(n, &n) && isprime(n))

%o t=0; for(n=2, 1e6, t+=1/(n-1); if(!isA000430(n) && gcd(n, numerator(t))>1, print1(gcd(n, numerator(t))", "))) \\ _Charles R Greathouse IV_, Sep 04 2013

%Y Cf. A001008, A228810.

%K nonn

%O 1,1

%A _Arkadiusz Wesolowski_, Sep 04 2013

%E a(14)-a(15) from _Charles R Greathouse IV_, Sep 04 2013

%E a(16)-a(21) from _Charles R Greathouse IV_, Sep 09 2013