Composite numbers for which the root mean square of proper divisors is an integer.

Terms

a(0) =35a(1) =49a(2) =55a(3) =145a(4) =215a(5) =341a(6) =545a(7) =589a(8) =1189a(9) =1681a(10) =1769a(11) =2449a(12) =2641a(13) =3005a(14) =3131a(15) =3599a(16) =4681a(17) =6931a(18) =7601a(19) =9899a(20) =10469a(21) =11215a(22) =15871a(23) =17639a(24) =19511a(25) =21691a(26) =23711a(27) =28345a(28) =28369a(29) =35429