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A022557 Numbers that are not the sum of a square and 2 nonnegative cubes. 6
7, 14, 15, 19, 21, 22, 23, 30, 40, 42, 46, 47, 48, 56, 59, 61, 62, 67, 75, 78, 85, 86, 87, 93, 94, 96, 98, 104, 105, 106, 110, 111, 112, 115, 117, 119, 120, 124, 131, 138, 139, 143, 147, 157, 159, 163, 166, 167, 173, 176, 180, 181, 183, 184, 187, 194, 195, 199, 200, 202 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
MAPLE
isA022557 := proc(n)
not isA022556(n) ;
end proc:
n := 1:
for c from 0 do
if isA022557(c) then
printf("%d %d\n", n, c);
n := n+1 ;
end if;
end do: # R. J. Mathar, Sep 02 2016
MATHEMATICA
smax = 50000;
A022556 = Table[s = i^2 + j^3 + k^3; If[s <= smax, s, Nothing], {i, 0, Sqrt[smax] // Ceiling}, {j, 0, smax^(1/3) // Ceiling}, {k, j, smax^(1/3) // Ceiling}] // Flatten // Union;
Complement[Range[smax], A022556] (* Jean-François Alcover, Feb 20 2023 *)
CROSSREFS
Cf. A022556 (complement).
Sequence in context: A232797 A354791 A107976 * A307546 A297261 A296705
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified March 28 22:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)