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%I
%S 1,2,3,5,6,7,9,10,11,13,14,15,16,18,19,20,21,22,23,25,26,27,28,29,30,
%T 31,33,34,35,36,37,38,39,40,42,43,44,45,46,47,48,49,50,51,53,54,55,56,
%U 57,58,59,60,61,62,63,64,65,67,68,69,70,71,72,73,74,75,76,77,78,79
%N a(n) = floor(Sum_{m=1..n} m^(1/m)).
%H G. C. Greubel, <a href="/A098572/b098572.txt">Table of n, a(n) for n = 1..5000</a>
%e floor(1^(1/1)+2^(1/2)+3^(1/3))=3 and floor(1^(1/1)+2^(1/2)+3^(1/3)+4^(1/4))=5.
%p A098572 := proc(p)
%p option remember;
%p add(root[i](i),i=1..p) ;
%p floor(%) ;
%p end proc:
%t Table[Floor[Sum[k^(1/k), {k, 1, n}]], {n, 1, 50}] (* _G. C. Greubel_, Feb 03 2018 *)
%o (PARI) for(n=1,30, print1(floor(sum(k=1,n, k^(1/k))), ", ")) \\ _G. C. Greubel_, Feb 03 2018
%o (Magma) [Floor((&+[k^(1/k): k in [1..n]])): n in [1..30]]; // _G. C. Greubel_, Feb 03 2018
%K easy,nonn
%O 1,2
%A Mark Hudson (mrmarkhudson(AT)hotmail.com), Sep 16 2004
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