Numbers k such that sigma(k)+1 is a square and sets a new record for such squares.

Terms

a(0) =2a(1) =7a(2) =8a(3) =14a(4) =32a(5) =54a(6) =60a(7) =72a(8) =84a(9) =120a(10) =196a(11) =252a(12) =312a(13) =378a(14) =512a(15) =540a(16) =860a(17) =990a(18) =1020a(19) =1350a(20) =1488a(21) =1560a(22) =2190a(23) =2232a(24) =3084a(25) =3144a(26) =3288a(27) =3444a(28) =3456a(29) =4620