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A163395
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a(n) = (n-th even nonprime)^(n-th even number).
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5
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1, 16, 1296, 262144, 100000000, 61917364224, 56693912375296, 72057594037927936, 121439531096594251776, 262144000000000000000000, 705429498686404044207947776, 2315513501476187716057433112576
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OFFSET
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1,2
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COMMENTS
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LINKS
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FORMULA
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EXAMPLE
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a(1) = 0^0 = 1, a(2) = 4^2 = 16, a(3) = 6^4 = 1296.
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MAPLE
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A163300 := proc(n) if n = 1 then 0; else for a from procname(n-1)+2 by 2 do if not isprime(a) then return a; end if; end do; end if; end proc: A005843 := proc(n) 2*n ; end: A163395 := proc(n) A163300(n)^A005843(n-1) ; end: seq(A163395(n), n=1..13) ; # R. J. Mathar, Oct 14 2009
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MATHEMATICA
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Join[{1}, Table[(2*(n - 1 + Mod[(n + 1), n]))^(2 n - 2), {n, 2, 10}]] (* G. C. Greubel, Dec 21 2016 *)
With[{nn=30}, Range[2, nn, 2]^Range[0, nn-2, 2]] (* Harvey P. Dale, Nov 09 2017 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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