A089347 - OEIS

%I #11 Mar 29 2015 12:11:59

%S 11,31,41,61,71,331,661,881,991,2221,3331,4441,6661,33331,99991,

%T 333331,3333331,9999991,33333331,6666666661,44444444441,555555555551,

%U 5555555555551,7777777777771,222222222222222221,333333333333333331

%N Primes of the form identical digits followed by a 1.

%H Vincenzo Librandi, <a href="/A089347/b089347.txt">Table of n, a(n) for n = 1..80</a>

%t Select[ FromDigits /@ Flatten[ Table[ PadLeft[{1}, i, # ] & /@ {1, 2, 3, 4, 5, 6, 7, 8, 9}, {i, 2, 18}], 1], PrimeQ[ # ] &] (* _Robert G. Wilson v_, Nov 15 2003 *)

%Y Cf. A089345, A089346.

%K base,nonn

%O 1,1

%A _Amarnath Murthy_, Nov 05 2003

%E More terms from _Ray Chandler_ and _Robert G. Wilson v_, Nov 07 2003