Numbers n (other than powers of 2) such that abs(abundance(n)) is an odd square.

Terms

a(0) =98a(1) =2116a(2) =4232a(3) =49928a(4) =80656a(5) =140450a(6) =550564a(7) =729632a(8) =1667138a(9) =2666689a(10) =8853632a(11) =9210632a(12) =12380288a(13) =15038884a(14) =37810208a(15) =57365476a(16) =108103808a(17) =155725952a(18) =197686728a(19) =247397768a(20) =257859364a(21) =327782408a(22) =398353538a(23) =544236032a(24) =775864832