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A345722 Numbers that are the sum of six fifth powers in eight or more ways. 6

%I #6 Jul 31 2021 16:37:46

%S 2295937600,4335900525,6251954544,8986552608,9085584992,13413708308,

%T 14539246326,15277569450,15728636000,16770321920,16873011232,

%U 16933805856,17572402769,17713454592,17960776999,18190647200,19621666592,20570070125,20827689300

%N Numbers that are the sum of six fifth powers in eight or more ways.

%H Sean A. Irvine, <a href="/A345722/b345722.txt">Table of n, a(n) for n = 1..389</a>

%e 4335900525 is a term because 4335900525 = 2^5 + 24^5 + 34^5 + 56^5 + 61^5 + 78^5 = 3^5 + 21^5 + 37^5 + 54^5 + 62^5 + 78^5 = 3^5 + 21^5 + 39^5 + 49^5 + 66^5 + 77^5 = 3^5 + 26^5 + 32^5 + 49^5 + 72^5 + 73^5 = 8^5 + 16^5 + 42^5 + 49^5 + 61^5 + 79^5 = 9^5 + 13^5 + 43^5 + 47^5 + 66^5 + 77^5 = 19^5 + 20^5 + 30^5 + 45^5 + 61^5 + 80^5 = 21^5 + 24^5 + 28^5 + 37^5 + 67^5 + 78^5.

%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**5 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 >= 8])

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

%o print(rets[x])

%Y Cf. A345565, A345630, A345721, A345723, A346363.

%K nonn

%O 1,1

%A _David Consiglio, Jr._, Jun 24 2021

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Last modified June 14 15:00 EDT 2024. Contains 373400 sequences. (Running on oeis4.)