OFFSET
1,1
COMMENTS
REFERENCES
R. K. Guy, Unsolved Problems in Number Theory, Section A2.
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..200
MATHEMATICA
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Farideh Firoozbakht, Aug 26 2003
STATUS
approved