There are string numbers: 1,2,4,7,11,16,22. How many of the first 50 numbers in this string are divided by 3 to 1?

1=1
2=1+
4=1+1+2
7=1+1+2+3
.
The nth is 1 + 1 + 2 + 3. + (n-1) = 1 + n * (n-1) / 2
Then the number of the third multiple or the number of the multiple of 3 greater than 1 is consistent
The first, the third, the fourth, the sixth, the seventh, the ninth, the tenth, the 48th and the 49th are 33 in total

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