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A067859
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a(1) = 1; a(n+1) = floor(sqrt(Sum_{k=1..n} a(k)^2)).
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0
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1, 1, 1, 1, 2, 2, 3, 4, 6, 8, 11, 16, 22, 31, 44, 62, 87, 123, 174, 246, 348, 492, 695, 983, 1390, 1966, 2780, 3931, 5559, 7862, 11118, 15723, 22236, 31446, 44471, 62892, 88942, 125783, 177884, 251566, 355768, 503132, 711536, 1006263, 1423071, 2012526, 2846142
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OFFSET
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1,5
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LINKS
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EXAMPLE
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a(6) = floor(sqrt(1^2 + 1^2 + 1^2 + 1^2 + 2^2)) = floor(sqrt(8)) = 2.
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MAPLE
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a:= proc(n) option remember; `if`(n=1, 1,
floor(sqrt(add(a(k)^2, k=1..n-1))))
end:
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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