A342894 Smallest number that is the sum of four positive n-th powers in three ways.

28, 1225, 16578, 1479604544, 1885800643779

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