Least exponent k such that the lowest n digits in the decimal representation of 2^k are even.

Terms

a(0) =1a(1) =6a(2) =10a(3) =11a(4) =19a(5) =43a(6) =50a(7) =50a(8) =71a(9) =71a(10) =523a(11) =590a(12) =590a(13) =12106a(14) =12106a(15) =12106a(16) =12106a(17) =56590a(18) =505206a(19) =1570511a(20) =1570511a(21) =4033966a(22) =4033966a(23) =9525771a(24) =24045606a(25) =24045606a(26) =57862019a(27) =183002599a(28) =183002599a(29) =877875719