OFFSET
1,1
COMMENTS
See A173348 for more information.
a(6) > 10^9. - Robert Price, Jun 08 2021
MATHEMATICA
Solutions[9, 5, 10^7] (* see A173348 *)
CROSSREFS
KEYWORD
nonn,more,hard
AUTHOR
T. D. Noe, Feb 22 2010
STATUS
approved