Numbers k of the form 4m+1 for which A087808(sigma(k)) is equal to 2*A087808(k).

Terms

a(0) =2009a(1) =19377a(2) =37809a(3) =59373a(4) =74673a(5) =115677a(6) =270041a(7) =310329a(8) =354609a(9) =357309a(10) =720425a(11) =732321a(12) =841437a(13) =2071737a(14) =2612269a(15) =3131149a(16) =3866461a(17) =3930929a(18) =5172093a(19) =5593981a(20) =7118753a(21) =7903961a(22) =8224173a(23) =9327393a(24) =9438129a(25) =11452321a(26) =12708025a(27) =18857209a(28) =18861889a(29) =18875313