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14 January, 17:27

What is the missing number for the sequel 1 2 5 10 13 blank

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  1. 14 January, 20:35
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    {a: a∈N ∧ a = x² + y²} = {1, 2, 5, 10, 13, 17, ... }

    Offset 1, 2

    1² + 2² = 1 + 4 = 5

    1² + 3² = 1 + 9 = 10

    2² + 3² = 4 + 9 = 13

    1² + 4² = 1 + 16 = 17
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