A004871 - OEIS

A004871

Numbers that are the sum of at most 9 positive 7th powers.

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 128, 129, 130, 131, 132, 133, 134, 135, 136, 256, 257, 258, 259, 260, 261, 262, 263, 384, 385, 386, 387, 388, 389, 390, 512, 513, 514, 515, 516, 517, 640, 641, 642, 643, 644, 768, 769, 770, 771, 896, 897, 898, 1024, 1025, 1152

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,3

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

MAPLE

N:= 3000: # for terms <= N

S[0]:= {0}:

for m from 1 to 9 do

S[m]:= map(t -> seq(t + i^7, i = 1 .. floor((N-t)^(1/7))), S[m-1])

od:

sort(convert(`union`(seq(S[i], i=0..9)), list)); # Robert Israel, Apr 11 2025