Oblong numbers (A002378) whose sum of divisors is also an oblong number.

Terms

a(0) =6a(1) =20a(2) =30a(3) =306a(4) =1722a(5) =2862a(6) =11772a(7) =13572a(8) =28730a(9) =29756a(10) =40602a(11) =54056a(12) =219492a(13) =351056a(14) =463080a(15) =947702a(16) =1391220a(17) =1546292a(18) =2043470a(19) =7174362a(20) =7703400a(21) =11400752a(22) =15104882a(23) =19127502a(24) =20155610a(25) =113667582a(26) =172173762a(27) =314299712a(28) =475654290a(29) =555238532