Solution
Each number is multiplied by 2 and then consecutive natural numbers are added
2 $$\times 2 + 1$$ = 5
5 $$\times 2 + 2$$ = 12
12 $$\times 2 + 3$$ = 27
27 $$\times 2 + 4$$ = 58
58 $$\times 2 + 5$$ = 121
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