%I #36 Feb 21 2023 03:56:32

%S 82,37765

%N Numbers k such that the reverse concatenation of the first k integers (A000422(k)) is a prime.

%C a(1) was pointed out by _Artur Jasinski_, Mar 30 2008 (see A000422).

%C a(2) was found by _Eric W. Weisstein_, Apr 06 2010.

%C a(3) > 84300. - _Tyler Busby_, Feb 21 2023

%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>

%H <a href="/index/Mo#MWP">Index entries for sequences related to Most Wanted Primes video</a>

%e a(1) is 82 since the 155-digit number 828180...54321 is prime.

%e a(2) is 37765 since the 177719-digit number 377653776437763...54321 is (a probable) prime.

%Y Cf. A000422, A007908, A176942.

%K nonn,hard,more,base,bref

%O 1,1

%A _Eric W. Weisstein_, Apr 06 2010

%E Edited by _N. J. A. Sloane_, Dec 03 2021