Numbers m that divide 4^(m + 1) + 1.

Terms

a(0) =1a(1) =17a(2) =4097a(3) =7361a(4) =85073a(5) =658529a(6) =3999137a(7) =72281281a(8) =285143057a(9) =628944689a(10) =854112113a(11) =1423081169a(12) =2561019281a(13) =3111576929a(14) =4298117633a(15) =5921265041a(16) =14224884929a(17) =21336998129a(18) =34317377233a(19) =50723421713a(20) =63797137889a(21) =144269032049a(22) =163834314353a(23) =187397322209a(24) =212565453281