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A049795
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a(n) = T(n,n-3), array T as in A049790.
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7
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1, 2, 3, 4, 7, 14, 18, 29, 35, 49, 57, 74, 84, 105, 115, 140, 155, 180, 195, 228, 244, 278, 296, 332, 356, 397, 416, 460, 487, 534, 559, 612, 637, 691, 722, 779, 814, 872, 901, 968, 1007, 1073, 1107, 1180, 1218, 1292, 1333, 1407
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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4,2
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LINKS
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MAPLE
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seq( `if`(n<7, n-3, add(floor((n-3)/floor((n-6)/j)), j=1..n-6)), n=4..60); # G. C. Greubel, Dec 10 2019
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MATHEMATICA
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Table[If[n<7, n-3, Sum[Floor[(n-3)/Floor[(n-6)/j]], {j, n-6}]], {n, 4, 60}] (* G. C. Greubel, Dec 10 2019 *)
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PROG
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(PARI) a(n) = if(n<7, n-3, sum(j=1, n-6, (n-3)\((n-6)\j)) );
(Magma) [n lt 7 select n-3 else (&+[Floor((n-3)/Floor((n-6)/j)): j in [1..n-6]]): n in [4..60]]; // G. C. Greubel, Dec 10 2019
(Sage)
def a(n):
if (n<7): return n-3
else: return sum(floor((n-3)/floor((n-6)/j)) for j in (1..n-6))
(GAP)
a:= function(n)
if n<7 then return n-3;
else return Sum([1..n-6], j-> Int((n-3)/Int((n-6)/j)) );
fi; end;
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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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