%I #11 Nov 14 2021 12:33:17

%S 11,3,777,999,11,33333333,777777777777777777777,

%T 999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999,

%U 1111111111111111111111111

%N Copies of 1,3,7 and 9 cyclically such that every partial concatenation is a prime.

%e 11, 113, 113777, 113777999, ... are all prime.

%Y Cf. A110774, A110775, A110776, A110777, A110778, A110780, A110781, A110783.

%K base,nonn

%O 1,1

%A _Amarnath Murthy_, Aug 12 2005

%E More terms from _Joshua Zucker_, Jan 11 2006

%E The next term is 726 3's and is too large to include.