Numbers k such that sigma(k) - 3k is prime.

Terms

a(0) =3600a(1) =17424a(2) =22500a(3) =32400a(4) =72900a(5) =291600a(6) =345744a(7) =360000a(8) =476100a(9) =518400a(10) =562500a(11) =656100a(12) =685584a(13) =756900a(14) =1040400a(15) =1382976a(16) =1411344a(17) =1742400a(18) =1904400a(19) =1988100a(20) =2073600a(21) =2250000a(22) =2340900a(23) =2624400a(24) =3027600a(25) =3111696a(26) =4161600a(27) =4284900a(28) =5760000a(29) =6051600