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A345513 Numbers that are the sum of six cubes in four or more ways. 8

%I

%S 626,830,837,856,873,891,947,954,982,1008,1026,1045,1052,1053,1071,

%T 1094,1097,1106,1109,1134,1143,1150,1153,1169,1172,1195,1208,1227,

%U 1234,1241,1253,1260,1267,1278,1279,1283,1286,1290,1297,1316,1323,1324,1358,1361,1368

%N Numbers that are the sum of six cubes in four or more ways.

%H Sean A. Irvine, <a href="/A345513/b345513.txt">Table of n, a(n) for n = 1..10000</a>

%e 830 is a term because 830 = 1^3 + 1^3 + 2^3 + 3^3 + 3^3 + 8^3 = 1^3 + 3^3 + 3^3 + 5^3 + 5^3 + 6^3 = 1^3 + 3^3 + 3^3 + 3^3 + 4^3 + 7^3 = 2^3 + 2^3 + 3^3 + 3^3 + 6^3 + 6^3.

%o (Python)

%o from itertools import combinations_with_replacement as cwr

%o from collections import defaultdict

%o keep = defaultdict(lambda: 0)

%o power_terms = [x**3 for x in range(1, 1000)]

%o for pos in cwr(power_terms, 6):

%o tot = sum(pos)

%o keep[tot] += 1

%o rets = sorted([k for k, v in keep.items() if v >= 4])

%o for x in range(len(rets)):

%o print(rets[x])

%Y Cf. A344034, A344808, A345512, A345514, A345522, A345561, A345766.

%K nonn

%O 1,1

%A _David Consiglio, Jr._, Jun 20 2021

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Last modified January 18 17:18 EST 2022. Contains 350455 sequences. (Running on oeis4.)