Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #5 Dec 05 2013 19:56:46
%S 2221,31,555555555551,71,1111111111111111111,131,
%T 1717171717171717171717171717171,191,2323231,29292929291,311,
%U 3737373737373737373737371,41411,431
%N Smallest prime of the form concatenation of prime(n) with itself followed by a 1.
%C Next prime, if it exists, is > 10^70. - _Sam Alexander_, Jan 09 2005
%Y Cf. A092993, A092994, A092995.
%K base,nonn
%O 1,1
%A _Amarnath Murthy_, Mar 28 2004
%E More terms from _Sam Alexander_, Jan 09 2005