Answer: 91
Spacing the five numbers as 1 3 7 13 21 (not joined as in question)
differences are 2 4 6 8
6th number then is 21 + 10 = 31
7th is 31 + 12 = 43
8th is 43 + 14 = 57
9th is 57 + 16 = 73
10th is 73 + 18 = 91
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The pattern is that each number equals to one tenth of the number before it. The number that will come next will be one tenth of 10, which is 1.
the tenth square number is 100.
19 is the tenth odd number, And is not a composite number or even number.
The number 232.5 is equal to one tenth of the number 2,325.
The tenth number is ten. The number ten is the tenth digit in the numbering system that is used in most of the world. This number is also the second place in a series of numbers beginning with the ones followed by the tens and hundreds.