Numbers k such that A007088(k) == 1 (mod k).

Terms

a(0) =1a(1) =5a(2) =15a(3) =25a(4) =55a(5) =91a(6) =137a(7) =525a(8) =625a(9) =925a(10) =3967a(11) =5995a(12) =7625a(13) =10767a(14) =25087a(15) =57225a(16) =68817a(17) =565027a(18) =591415a(19) =2515825a(20) =2757625a(21) =4162019a(22) =5276309a(23) =96689255a(24) =115686005a(25) =133890625a(26) =242899421a(27) =492029715a(28) =588620625a(29) =1839399055