38
20+3 = 23
23+6=29
29+9=38
A
A
A single number, such as 21357, does not define a sequence.
p
D20G
It is: Y
K
Check out the link for the sequence.
h o n
040608
L
The sequence "rygb" represents the first letters of the colors in the rainbow: red, yellow, green, and blue. The next color in the sequence is indigo, which starts with the letter "i." Therefore, the next letter in the sequence is "i."