0
Anonymous
15, 24, 39
Each number is the sum of the two before it
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1834 (3+1)6 (4+2)9 (6+3)13 (9+4)18 (13+5)...and so on
-3 -6 - -9 -6 = -6+9-6 = 3 - 6= -3
18 3 +1 4 +2 6 +3 9 +4 13 +5 18 +6 24 +7 31 +8 39 +9 48 +10 58...
10
31