OFFSET
1,1
LINKS
Harry J. Smith, Table of n, a(n) for n = 1..41
PROG
(PARI) for(n=1, 30, if(issquarefree(9^n-n^9), print1(9^n-n^9, ", ")))
CROSSREFS
KEYWORD
easy,sign
AUTHOR
Jason Earls, Jul 26 2001
EXTENSIONS
Offset changed by Andrew Howroyd, Sep 18 2024
STATUS
approved