%I
%S 82,37765
%N Reverse concatenation of the first a(n) integers gives a prime.
%C a(2) found by _Eric W. Weisstein_, Apr 06 2010.
%C a(n) = indices n for which A000422(n) is prime.  _Arkadiusz Wesolowski_, Apr 29 2012
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/ConsecutiveNumberSequences.html">Consecutive Number Sequences</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/IntegerSequencePrimes.html">Integer Sequence Primes</a>
%e a(1) is 82 since the 155digit number 828180...54321 is prime.
%e a(2) is 37765 since the 177719digit number 377653776437763...54321 is prime.
%K nonn,hard,more,base,bref
%O 1,1
%A _Eric W. Weisstein_, Apr 06 2010
