Find the missing number: 81, 27, 9, 3, ?

Each term is divided by 3, so 3 ÷ 3 = 1.

What is the next number: 2, 5, 11, 23, 47, ?

Each term is doubled and then 1 is added: 47 × 2 + 1 = 95.

These are perfect squares (1², 2², 3², …), so the next is 6² = 36.

Each term doubles: 56 × 2 = 112.

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What number comes next in the series: 3, 6, 11, 18, 27, ?