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1st. 2nd. 4th. 5th. 3rd. 21. 5. 9. 13. 17. +4. +4. +4. +4. Step 1 Spot the difference between the numbers (+4). Step 2 Multiply the difference by a person in the sequence (n). Step 3 Add or subtract to get the number in the sequence(+1). Step 4
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1st 2nd 4th 5th 3rd 21 5 9 13 17 +4 +4 +4 +4 Step 1 Spot the difference between the numbers (+4). Step 2 Multiply the difference by a person in the sequence (n). Step 3 Add or subtract to get the number in the sequence(+1). Step 4 Check your formula works for a few (eg ..