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A152580
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a(n) = 7^(2^n) + 2.
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1
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OFFSET
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0,1
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COMMENTS
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These numbers are divisible by 3. This follows by expanding the binomial (6+1)^(2^n) + 2 to get 6h + 1 + 2 for some h. Therefore 3 divides 7^(2^n) + 2.
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LINKS
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FORMULA
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MAPLE
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PROG
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(PARI) g(a, n) = if(a%2, b=2, b=1); for(x=0, n, y=a^(2^x)+b; print1(y", "))
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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