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%I #5 Nov 14 2021 12:37:39
%S 11,99999,111111111,9999999999,11111111111111111111111111111111111111,
%T 99999999999999999999999999999999999999999999999
%N Copies of 1 and 9 alternately such that every partial concatenation is a prime.
%e 11, 1199999, 1199999111111111, ... are all prime.
%Y Cf. A110774, A110775, A110776, A110777, A110778, A110781.
%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 has more than 800 1's and is too large to include.
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