Position of rightmost digit 0 in 2^A031140(n).

Terms

a(0) =2a(1) =5a(2) =8a(3) =11a(4) =12a(5) =13a(6) =14a(7) =23a(8) =36a(9) =38a(10) =54a(11) =57a(12) =59a(13) =93a(14) =115a(15) =119a(16) =120a(17) =121a(18) =136a(19) =138a(20) =164a(21) =174a(22) =176a(23) =191a(24) =196a(25) =212a(26) =217a(27) =227a(28) =233a(29) =249