Numbers k such that sigma(triangular(k)) = sigma(k)^2.

Terms

a(0) =1a(1) =11a(2) =695a(3) =991a(4) =2839a(5) =3707a(6) =9347a(7) =10703a(8) =12847a(9) =27089a(10) =42251a(11) =56419a(12) =74671a(13) =115289a(14) =168739a(15) =191051a(16) =219295a(17) =233729a(18) =280111a(19) =300731a(20) =326899a(21) =353651a(22) =430859a(23) =611799a(24) =642991a(25) =661715a(26) =1035827a(27) =1116607a(28) =1181579a(29) =1234519