OFFSET
1,1
LINKS
Sean A. Irvine, Table of n, a(n) for n = 1..1000
EXAMPLE
25 = 1^2 + 1^2 + 1^2 + 1^2 + 1^2 + 2^2 + 4^2
= 1^2 + 2^2 + 2^2 + 2^2 + 2^2 + 2^2 + 2^2
so 25 is a term.
PROG
(Python)
from itertools import combinations_with_replacement as cwr
from collections import defaultdict
keep = defaultdict(lambda: 0)
power_terms = [x**2 for x in range(1, 1000)]
for pos in cwr(power_terms, 7):
tot = sum(pos)
keep[tot] += 1
rets = sorted([k for k, v in keep.items() if v >= 2])
for x in range(len(rets)):
print(rets[x])
CROSSREFS
KEYWORD
nonn
AUTHOR
David Consiglio, Jr., Jun 20 2021
STATUS
approved