A
ADD 2
EX.: 2, 4, 6...
ADD 5
EX.: 5, 10, 15...
ADD 10
EX.: 10, 20, 30...
ODD NUMBERS
EX.: 1, 3, 5
FOLLOWED NUMBERS
EX.: 11, 22, 33...
EVEN NUMBERS
EX.: 2, 4, 6..
ADD 3
EX.: 1, 4, 7...
ADD 7
EX.: 7, 14, 21...
ADD 15
EX.: 15, 30, 45...