A047720 Numbers that are the sum of 9 but no fewer nonzero fourth powers.

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

Offset

1,1

Links

David A. Corneth, Table of n, a(n) for n = 1..16848 (first terms <= 200000)

Prog

(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

Crossrefs

Cf. A000583, A002377, A003343.

Sequence in context: A121453 A003343 A345843 * A320599 A293846 A212462

Adjacent sequences: A047717 A047718 A047719 * A047721 A047722 A047723

Keyword

nonn

Author

Arlin Anderson (starship1(AT)gmail.com)

Status

approved