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A176024 Reverse concatenation of the first a(n) integers gives a prime. 1


%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 155-digit number 828180...54321 is prime.

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

%K nonn,hard,more,base,bref

%O 1,1

%A _Eric W. Weisstein_, Apr 06 2010

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Last modified May 26 07:30 EDT 2017. Contains 287093 sequences.