The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A344240 Numbers that are the sum of three fourth powers in exactly three ways. 6
 811538, 1733522, 2798978, 3750578, 4614722, 6573938, 7303842, 8878898, 12771458, 12984608, 13760258, 14677362, 15601698, 16196193, 17868242, 21556178, 22349522, 25190802, 25589858, 27736352, 29969282, 41532498, 44048498, 44783648, 45182018, 50944418, 54894242, 57052562, 59165442, 60009248 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Differs from A344239 at term 6 because 5978882 = 3^4 + 40^4 + 43^4 = 8^4 + 37^4 + 45^4 = 15^4 + 32^4 + 47^4 = 23^4 + 25^4 + 48^4 LINKS David Consiglio, Jr., Table of n, a(n) for n = 1..5129 EXAMPLE 2798978 is a member of this sequence because 2798978 = 6^4 + 31^4 + 37^4 = 9^4 + 29^4 + 38^4 = 13^4 + 26^4 + 39^4 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. A025397, A344192, A344239, A344242, A344278. Sequence in context: A083617 A343082 A344239 * A238522 A372300 A210060 Adjacent sequences: A344237 A344238 A344239 * A344241 A344242 A344243 KEYWORD nonn AUTHOR David Consiglio, Jr., May 12 2021 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified July 15 07:59 EDT 2024. Contains 374324 sequences. (Running on oeis4.)