

A224848


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


0




OFFSET

1,1


COMMENTS

The number corresponding to a(5) = 2818 is a probable prime of 18269 digits.  Giovanni Resta, Jul 25 2013


LINKS



EXAMPLE

a(4) = 700 because reverse concatenation of squares of 1 to 700 gives 490000488601......2516941 which is a 3742digit prime number.


CROSSREFS



KEYWORD

nonn,hard,more,base


AUTHOR



EXTENSIONS



STATUS

approved



