Numbers k that divide 2^(k+3) - 1.

Terms

a(0) =1a(1) =3a(2) =5a(3) =9a(4) =21a(5) =45a(6) =63a(7) =85a(8) =105a(9) =117a(10) =273a(11) =285a(12) =357a(13) =585a(14) =627a(15) =765a(16) =1365a(17) =1397a(18) =1449a(19) =1677a(20) =1989a(21) =2337a(22) =3597a(23) =3705a(24) =3885a(25) =4221a(26) =4365a(27) =4485a(28) =4797a(29) =4953