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What is the rule pattern for 9,11,15,23,39,7?

What is the rule pattern for 9,11,15,23,39,7?
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3 votes
What is the rule pattern for 9,11,15,23,39,7?

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User Yoonju
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2 Answers

3 votes
add 2 then multiply by 2
answered
User Eli Stevens
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4 votes

9,11,15,23,39,71 \\9+2\rightarrow11+4\rightarrow15+8\rightarrow23+16\rightarrow39+32=71 \\9+2^1\rightarrow11+2^2\rightarrow15+2^3\rightarrow23+2^4\rightarrow39+2^5\rightarrow71 \\ \\a_n=7+2^n
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User Divers
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8.8k points
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