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12 January, 18:00

What is the rule of this pattern 1, 21, 85, 341

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Answers (2)
  1. 12 January, 20:38
    0
    5 x 4 + 1 = 21

    21 x 4 + 1 = 85

    85 x 4 + 1 = 341
  2. 12 January, 21:43
    0
    Multiply everything except the first starting number by 4 then add 1
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