Sequence 1, 2, 4, 5, 10, 11, 22, 23, 46, 47..., the law it forms: the second item is equal to the sum of the first item plus 1, the third item is equal to twice the second item, The 4th item is equal to the sum of the 3rd item plus 1, the 5th item is equal to 2 times of the 4th item, ..., and so on, to get the above sequence. So, what is the ones digit of the 100th term of this sequence
数列1，2，4，5，10，11，22，23，46，47…，它形成的规律：第2项等于第1项加1的和，第3项等于第2项的2倍，第4项等于第3项加1的和，第5项等于第4项的2倍，…，如此继续下去，得到上面的数列．那么，这个数列的第100项的个位数字是多少
<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<result>5</result>