Find the rule and fill in the number 9 1 4 3 (121) (). What's the rule of this sequence? Write the rule clearly? I'm so sorry. There's a number missing in the middle. The original questions are 9, 1, 4, 3, 40, ()

Find the rule and fill in the number 9 1 4 3 (121) (). What's the rule of this sequence? Write the rule clearly? I'm so sorry. There's a number missing in the middle. The original questions are 9, 1, 4, 3, 40, ()

Divide each one by three and see the remainder
The remainder is 0;
The remainder is 1;
The remainder is 1;
The remainder is 0;
The remainder is 1;
If there are two numbers with the remainder of 1, then there is a multiple before subtracting 1, that is, n = (4-1) △ 1 = 3; then there is (x-1) △ 40 = 3 (x is the sixth number)
That is: x = 40 × 3 + 1 = 121
It seems to be the answer, but what you write is different. Let's see if you read the wrong question···