a(n) is the smallest number k such that 2k - sigma(k) = 2^n.

Terms

a(0) =3a(1) =5a(2) =22a(3) =17a(4) =250a(5) =134a(6) =262a(7) =257a(8) =6556a(9) =4124a(10) =10330a(11) =8198a(12) =91036a(13) =19649a(14) =65542a(15) =65537a(16) =1442716a(17) =524294a(18) =1363258a(19) =4194332a(20) =4411642a(21) =16442342a(22) =16866106a(23) =22075325a(24) =156791188a(25) =536871032a(26) =2160104368a(27) =536870918a(28) =1074187546a(29) =2147483654