Numbers k such that both sigma(k) >= 2*k-1 and sigma(k+1) >= 2*(k+1)-1.

Terms

a(0) =1a(1) =4095a(2) =5775a(3) =5984a(4) =7424a(5) =11024a(6) =21735a(7) =21944a(8) =26144a(9) =27404a(10) =39375a(11) =43064a(12) =49664a(13) =56924a(14) =58695a(15) =61424a(16) =69615a(17) =70784a(18) =76544a(19) =77175a(20) =79695a(21) =81080a(22) =81675a(23) =82004a(24) =84524a(25) =84644a(26) =89775a(27) =91664a(28) =98175a(29) =103455