Starting with the 4... add 4 each time. From the 7... add 7 each time. The next four numbers in the series are... 20, 35, 24 & 42
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E 13 the order is :7 ,12 ,14 ,16 ,21 ,24 ,25 ,27 .
8 to 14 12 to 21 16 to 28
3, -6, 12, 4, 20, 13, 27, 21, 33 -9, +18, -8, +16, -7, +14, -6, +12
3, -6, 12, 4, 20, 13, 27, 21, 33 -9, +18, -8, +16, -7, +14, -6, +12
Between 11 and 21: 12, 14, 15, 16, 18 and 20.