Numbers n for which the absolute value of the abundance of both n and n^2 is a prime number.

Terms

a(0) =3a(1) =9a(2) =10a(3) =18a(4) =50a(5) =100a(6) =104a(7) =121a(8) =136a(9) =289a(10) =464a(11) =576a(12) =650a(13) =900a(14) =5041a(15) =6962a(16) =7225a(17) =10201a(18) =14400a(19) =55225a(20) =65025a(21) =87025a(22) =102152a(23) =147456a(24) =171698a(25) =174050a(26) =179776a(27) =182329a(28) =189225a(29) =201601