Card numbers for top card reappearing at the top after three shuffles (Monthly problem 12008).

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =8a(5) =10a(6) =14a(7) =16a(8) =32a(9) =36a(10) =51a(11) =60a(12) =64a(13) =128a(14) =136a(15) =141a(16) =248a(17) =256a(18) =512a(19) =528a(20) =819a(21) =910a(22) =1008a(23) =1024a(24) =2048a(25) =2080a(26) =4064a(27) =4096a(28) =5041a(29) =8192