A047698 Numbers that are the sum of four positive seventh powers in two or more ways.
2056364173794800, 12191487610289536, 263214614245734400, 696885239160606459, 1560510414117060608, 4497268448089227600, 18896044524917750533, 25704745581139341318, 26662783403703215232, 33691470623454003200, 44053472466326057527, 100502405478837434259
Offset: 1
Examples
4497268448089227600 = 30^7 + 42^7 + 369^7 + 447^7 = 45^7 + 270^7 + 387^7 + 438^7. - _Sean A. Irvine_, May 15 2021
Links
- D. J. Bernstein, Enumerating solutions to p(a) + q(b) = r(c) + s(d)
- R. L. Ekl, New Results in Equal Sums of Like Powers, Math. Comput. 67, 1309-1315, 1998.
Extensions
Corrected by D. J. Bernstein (djb(AT)cr.yp.to)
a(6)-a(12) from Sean A. Irvine, May 14 2021