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A047720
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Numbers that are the sum of 9 but no fewer nonzero fourth powers.
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2
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9, 24, 39, 54, 69, 89, 104, 119, 134, 144, 149, 169, 184, 199, 209, 214, 229, 249, 264, 279, 294, 309, 329, 344, 359, 374, 384, 389, 404, 409, 424, 439, 449, 454, 469, 484, 489, 504, 519, 534, 549, 564, 569, 579, 584, 599, 614, 624, 633, 649, 664, 679, 694
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OFFSET
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1,1
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LINKS
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PROG
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(PARI) upto(n)={my(e=9); my(s=sum(k=1, sqrtint(sqrtint(n)), x^(k^4)) + O(x*x^n)); my(p=s^e, q=(1 + s)^(e-1)); select(k->polcoeff(p, k) && !polcoeff(q, k), [1..n])} \\ Andrew Howroyd, Jul 06 2018
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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Arlin Anderson (starship1(AT)gmail.com)
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STATUS
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approved
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