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

Terms

a(0) =1a(1) =3a(2) =8a(3) =22a(4) =66a(5) =170a(6) =210a(7) =490a(8) =510a(9) =930a(10) =1470a(11) =2130a(12) =2910a(13) =3810a(14) =5406a(15) =5970a(16) =7230a(17) =7590a(18) =10110a(19) =12306a(20) =13470a(21) =14322a(22) =17310a(23) =17490a(24) =23142a(25) =26430a(26) =29010a(27) =32430a(28) =37470a(29) =42546