Numbers of the form 2^(n-1)*(2^(n*m)-1)/(2^n-1), n >= 1, m >= 1.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =7a(5) =8a(6) =10a(7) =15a(8) =16a(9) =31a(10) =32a(11) =36a(12) =42a(13) =63a(14) =64a(15) =127a(16) =128a(17) =136a(18) =170a(19) =255a(20) =256a(21) =292a(22) =511a(23) =512a(24) =528a(25) =682a(26) =1023a(27) =1024a(28) =2047a(29) =2048