Numbers k such that cototient(k) is a square and sets a new record for squares.

Terms

a(0) =2a(1) =6a(2) =21a(3) =24a(4) =54a(5) =96a(6) =189a(7) =216a(8) =345a(9) =384a(10) =420a(11) =796a(12) =864a(13) =1332a(14) =1536a(15) =1680a(16) =2340a(17) =3300a(18) =3780a(19) =5328a(20) =6144a(21) =6516a(22) =6720a(23) =8260a(24) =8484a(25) =9360a(26) =10500a(27) =13200a(28) =14532a(29) =15120