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 A344239 Numbers that are the sum of three fourth powers in three or more ways. 6
 811538, 1733522, 2798978, 3750578, 4614722, 5978882, 6573938, 7303842, 8878898, 12771458, 12984608, 13760258, 14677362, 15601698, 15916082, 16196193, 17868242, 20621042, 21556178, 22349522, 22673378, 25190802, 25589858, 27736352, 29969282, 30623138, 33998258, 39765362, 41532498, 44048498 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS David Consiglio, Jr., Table of n, a(n) for n = 1..14213 EXAMPLE 2798978 = 6^4 + 31^4 + 37^4 = 9^4 + 29^4 + 38^4 = 13^4 + 26^4 + 39^4 so 2798978 is a term of this sequence. PROG (Python) from itertools import combinations_with_replacement as cwr from collections import defaultdict keep = defaultdict(lambda: 0) power_terms = [x**4 for x in range(1, 50)] for pos in cwr(power_terms, 3): tot = sum(pos) keep[tot] += 1 rets = sorted([k for k, v in keep.items() if v >= 3]) for x in range(len(rets)): print(rets[x]) CROSSREFS Cf. A025398, A309762, A344240, A344241, A344277. Sequence in context: A178290 A083617 A343082 * A344240 A238522 A372300 Adjacent sequences: A344236 A344237 A344238 * A344240 A344241 A344242 KEYWORD nonn AUTHOR David Consiglio, Jr., May 12 2021 STATUS approved

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Last modified July 15 19:27 EDT 2024. Contains 374334 sequences. (Running on oeis4.)