OFFSET
1,1
COMMENTS
Previous name was: There exist no palindromic nonagonals (enneagonals) of length n.
LINKS
P. De Geest, Palindromic nonagonals
MATHEMATICA
A082723 = {0, 1, 9, 111, 474, 969, 6666, 18981, 67276, 4411144, 6964696, 15444451, 57966975, 448707844, 460595064, 579696975, 931929139, 994040499, 1227667221, 9698998969, 61556965516, 664248842466, 699030030996, 99451743334715499, 428987160061789824, 950178723327871059, 1757445628265447571, 4404972454542794044, 9433971680861793349, 499583536595635385994, 1637992008558002997361, 19874891310701319847891};
Select[Range[22], A082722[#] == 0 &] (* Robert Price, Apr 29 2019 *)
CROSSREFS
KEYWORD
nonn,base,hard
AUTHOR
Patrick De Geest, Apr 13 2003
EXTENSIONS
Definition edited by Jon E. Schoenfield, Sep 15 2013
STATUS
approved