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A147771
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a(n) = round(n^(n/2)).
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3
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1, 2, 5, 16, 56, 216, 907, 4096, 19683, 100000, 534146, 2985984, 17403307, 105413504, 661735514, 4294967296, 28761784748, 198359290368, 1406563064942, 10240000000000, 76436817165460, 584318301411328, 4569515072723572
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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LINKS
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MATHEMATICA
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lst={}; Do[AppendTo[lst, Round[(n^n)^(1/2)]], {n, 40}]; lst
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PROG
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(Python)
from gmpy2 import isqrt_rem
i, j = isqrt_rem(n**n)
return int(i+int(4*(j-i) >= 1)) # Chai Wah Wu, Aug 16 2016
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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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