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A224924
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Sum_{i=0..n} Sum_{j=0..n} (i AND j), where AND is the binary logical AND operator.
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4
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0, 1, 3, 12, 16, 33, 63, 112, 120, 153, 211, 300, 408, 553, 735, 960, 976, 1041, 1155, 1324, 1536, 1809, 2143, 2544, 2952, 3433, 3987, 4620, 5320, 6105, 6975, 7936, 7968, 8097, 8323, 8652, 9072, 9601, 10239, 10992, 11800, 12729, 13779, 14956, 16248, 17673, 19231, 20928
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,3
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COMMENTS
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LINKS
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FORMULA
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a(2^n) = a(2^n - 1) + 2^n.
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MAPLE
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read("transforms") :
local a, i, j ;
a := 0 ;
for i from 0 to n do
for j from 0 to n do
a := a+ANDnos(i, j) ;
end do:
end do:
a ;
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MATHEMATICA
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a[n_] := Sum[BitAnd[i, j], {i, 0, n}, {j, 0, n}];
Table[a[n], {n, 0, 20}]
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PROG
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(Python)
for n in range(99):
s = 0
for i in range(n+1):
for j in range(n+1):
s += i & j
print(s, end=', ')
(PARI) a(n)=sum(i=0, n, sum(j=0, n, bitand(i, j))); \\ R. J. Cano, Aug 21 2013
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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