%I A110776
%S A110776 11,777,11,777777,111111111,7777777777777777777777777,111111111,777
%N A110776 Copies of 1 and 7 alternately such that every partial concatenation is 
               a prime.
%e A110776 11,11777,1177711,... are all prime.
%Y A110776 Cf. A110774, A110775, A110777, A110778, A112534, A110780, A110781, A110782, 
               A110783, A110788, A110789
%Y A110776 Sequence in context: A115737 A036933 A028457 this_sequence A058392 A100369 
               A162448
%Y A110776 Adjacent sequences: A110773 A110774 A110775 this_sequence A110777 A110778 
               A110779
%K A110776 base,nonn
%O A110776 1,1
%A A110776 Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Aug 12 2005
%E A110776 Corrected and extended by Joshua Zucker, Jan 11 2006
%E A110776 The next term has 762 1's and is too large to include.