A342893 Smallest number that is the sum of three positive n-th powers in three ways.
54, 5104, 811538
Offset: 2
Examples
a(2) = 54 = 1+4+49 = 4+25+25 = 9+9+36.
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.