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A027564
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Numbers not of form abcd + abce + abde + acde + bcde for 1 <= a <= b <= c <= d <= e.
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4
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1, 2, 3, 4, 6, 7, 8, 10, 11, 12, 14, 15, 18, 19, 20, 22, 24, 26, 27, 31, 32, 34, 35, 36, 38, 39, 42, 46, 47, 50, 54, 55, 59, 60, 62, 66, 67, 70, 71, 75, 78, 84, 87, 90, 92, 94, 98, 99, 102, 104, 106, 110, 111, 115, 116, 119, 122, 126, 127, 130, 131, 132, 138
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listen;
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OFFSET
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1,2
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LINKS
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MAPLE
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N := 1000: # for all terms <= N
V:= Vector(N):
for a from 1 to floor((N/5)^(1/4)) do
for b from a while 4*a*b^3+b^4<= N do
for c from b while 3*a*b*c^2 + (a+b)*c^3 <= N do
for d from c while 2*a*b*c*d + (b*c+a*c+a*b)*d^2 <= N do
for e from d do
r:= a*b*c*d+a*b*c*e+a*b*d*e+a*c*d*e+b*c*d*e;
if r > N then break fi;
V[r]:= 1;
od od od od od:
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CROSSREFS
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KEYWORD
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nonn,fini
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AUTHOR
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STATUS
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approved
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