3, 10, 20, 33, 49, 68, ___

3, 10, 20, 33, 49, 68, 90

3 + 7 = 10

10 + 10 (+3)  = 20

20 + 13(+3) = 33

33 + 16(+3) = 49

49 + 19(+3) = 68

68 + 22(+3) = 90

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