Least k such that 2^n+k is a brilliant number (A078972).

Terms

a(0) =2a(1) =0a(2) =1a(3) =5a(4) =3a(5) =57a(6) =15a(7) =33a(8) =5a(9) =3a(10) =11a(11) =75a(12) =441a(13) =75a(14) =81a(15) =31a(16) =21a(17) =15a(18) =429a(19) =2013a(20) =51a(21) =87a(22) =5a(23) =21a(24) =57a(25) =33a(26) =711a(27) =87a(28) =65a(29) =57