Numbers k such that k^3 divides 9^(k^2) + 1.

Terms

a(0) =1a(1) =5a(2) =505a(3) =5905a(4) =596405a(5) =1971005a(6) =199071505a(7) =515151005a(8) =581457505a(9) =618181105a(10) =2327756905a(11) =11855474405a(12) =19555113485a(13) =31361954905a(14) =101901244565a(15) =235103447405a(16) =305354088005a(17) =395331063745a(18) =600905819065a(19) =608393336905a(20) =686701313405a(21) =730071885005