OFFSET
1,1
COMMENTS
No additional terms < 10^7. See A173348 for more information.
a(4) > 10^9. - Robert Price, Jun 02 2021
MATHEMATICA
Solutions[11, 8, 10^7] (* see A173348 *)
CROSSREFS
KEYWORD
nonn,bref,more,hard
AUTHOR
T. D. Noe, Feb 22 2010
STATUS
approved