%I A147556
%S A147556 11,37,271,4649,513239,265371653,5363222357,1111111111111111111,
%T A147556 11111111111111111111111,77843839397,57336415063790604359,
%U A147556 2212394296770203368013,201763709900322803748657942361
%N A147556 Largest prime factor of prime(n)-th repunit number.
%C A147556 The sequence of repunit primes is a subsequence of this sequence.
%e A147556 Prime(15)=47 and (10^47-1)/9=35121409*316362908763458525001406154038726382279
%e A147556 so a(15)=316362908763458525001406154038726382279.
%Y A147556 Cf. A004022, A147555.
%Y A147556 Sequence in context: A003020 A075024 A152094 this_sequence A120833 A034969 
               A052432
%Y A147556 Adjacent sequences: A147553 A147554 A147555 this_sequence A147557 A147558 
               A147559
%K A147556 nonn
%O A147556 1,1
%A A147556 Farideh Firoozbakht (mymontain(AT)yahoo.com), Dec 26 2008