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A330831
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a(n) = (F_n^2 - 1)^2, where F_n is a Fermat prime, A019434.
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2
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OFFSET
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1,1
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COMMENTS
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Also the second element of the power-spectral basis of A330829.
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LINKS
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FORMULA
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a(n) = (F(n)^2 - 1)^2, where F(n) = 2^(2^n)+1 is a Fermat prime.
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EXAMPLE
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a(0) = (3^2 - 1)^2 = 64.
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MAPLE
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F := proc(n) return 2^(2^n)+1 end;
a := proc(n) if isprime(F(n)) then return (F(n)^2-1)^2 fi; end;
[seq(a(n), n=0..4)];
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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