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A343082 a(n) is the smallest number that is the sum of n positive 4th powers in three ways. 5
811538, 16578, 4225, 2676, 2677, 518, 519, 520, 521, 522, 523, 524, 525, 526, 272, 273, 274, 275, 276, 277, 278, 279, 280, 281, 282, 283, 284, 285, 286, 287, 288, 289, 290, 291, 292, 293, 294, 295, 296, 297, 298, 299, 300, 301, 302, 303, 304, 305, 306, 307 (list; graph; refs; listen; history; text; internal format)
OFFSET
3,1
COMMENTS
This is r(n,4,3) in Alter's notation.
LINKS
R. Alter, Computations and generalizations on a remark of Ramanujan, pp. 182-196 of "Analytic Number Theory (Philadelphia, 1980)", ed. M. I. Knopp, Lect. Notes Math., Vol. 899, 1981. See Table 8, page 192.
FORMULA
a(n) = n + 255 for n >= 17.
EXAMPLE
a(3) = 811538 = 4^4 + 23^4 + 27^4 = 7^4 + 21^4 + 28^4 = 12^4 + 17^4 + 29^4.
a(4) = 16578 = 1^4 + 2^4 + 9^4 + 10^4 = 2^4 + 5^4 + 6^4 + 11^4 = 3^4 + 7^4 + 8^4 + 10^4.
CROSSREFS
Sequence in context: A270117 A178290 A083617 * A344239 A344240 A238522
KEYWORD
nonn
AUTHOR
Sean A. Irvine, Apr 04 2021
STATUS
approved

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Last modified July 15 14:51 EDT 2024. Contains 374333 sequences. (Running on oeis4.)