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You need to add 12.
Well, honey, to add 23 over 4 and make it equal 6, you simply subtract 6 from 23 over 4. That leaves you with 11 over 4. So, technically, 23 over 4 minus 11 over 4 equals 6. Math can be a real hoot sometimes, can't it?
You need to add 7 (or +7)
4 6 9 13 18 24 31 39 ...... Add 2 to 4 to get 6 then add 3 to 6 to get 9 then add 4 to 9 to get 13 and so on.
-1,-2,+2,-4,+4,-5,+5, +0. the sequence is subtract twice, add once, subtract again, add, then subtract, then add twice.