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A342894 Smallest number that is the sum of four positive n-th powers in three ways. 1
28, 1225, 16578, 1479604544, 1885800643779 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..6.

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.

EXAMPLE

a(2) = 28 = 1+1+1+25 = 4+4+4+16 = 1+9+9+9.

CROSSREFS

Cf. A230563, A342893-A342903.

Sequence in context: A132503 A092705 A061321 * A281328 A091993 A213692

Adjacent sequences:  A342891 A342892 A342893 * A342895 A342896 A342897

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Apr 04 2021

EXTENSIONS

a(5)-a(6) from Jinyuan Wang, Apr 10 2021

STATUS

approved

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Last modified October 16 00:29 EDT 2021. Contains 348034 sequences. (Running on oeis4.)