NB
3,9,21,39,63.
We note that
#1;The difference between 3 & 9 = 6
#2 ;The difference between 9 & 21 = 12 ( 2 x 6)
#3 ; The difference between 21 & 39 = 18 ( 3 x 6)
#4 ; The difference between 39 & 63 = 24 ( 4 x 6)
So it follows
#5 ; The difference between 63 & X = ( 5 x 6 = 30 )
So 63 + 30 = 93 The answer !!!!!
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Then the number is 21 because 3 times 21 = 63
The least common multiple is the smallest number that is multiple of two or more numbers. 21: 21, 42, 63 63: 63 The LCM of 21 and 63 is 63.
1/3 of 63 is 21.
A single number, such as 18233039, cannot define a series.
1, 3, 7, 9, 21, 63