

A176024


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


1




OFFSET

1,1


COMMENTS

a(2) found by Eric W. Weisstein, Apr 06 2010.
a(n) = indices n for which A000422(n) is prime.  Arkadiusz Wesolowski, Apr 29 2012


LINKS

Table of n, a(n) for n=1..2.
Eric Weisstein's World of Mathematics, Consecutive Number Sequences
Eric Weisstein's World of Mathematics, Integer Sequence Primes


EXAMPLE

a(1) is 82 since the 155digit number 828180...54321 is prime.
a(2) is 37765 since the 177719digit number 377653776437763...54321 is prime.


CROSSREFS

Sequence in context: A280671 A241129 A282157 * A204976 A204703 A206648
Adjacent sequences: A176021 A176022 A176023 * A176025 A176026 A176027


KEYWORD

nonn,hard,more,base,bref


AUTHOR

Eric W. Weisstein, Apr 06 2010


STATUS

approved



