Least k >= 6 such that A087666(k) = n.

Terms

a(0) =6a(1) =10a(2) =14a(3) =7a(4) =8a(5) =31a(6) =35a(7) =17a(8) =43a(9) =40a(10) =229a(11) =248a(12) =212a(13) =818a(14) =799a(15) =733a(16) =151a(17) =2191a(18) =1139a(19) =20894a(20) =877a(21) =6835a(22) =20528a(23) =34627a(24) =19687a(25) =91790a(26) =34502a(27) =367558a(28) =85336a(29) =46375