A060835 Least number of the form x^2 + y^3 (x, y positive) in n ways.

2, 17, 1737, 1025, 92025, 3375900, 5472225, 35964225, 930860225, 1000837225, 4979585600, 38515961025, 88154795025, 203947076025, 88813460025, 5684061441600, 77806025000000, 64745012358225

Offset: 1

Author

David W. Wilson, May 02 2001

Keywords

• nonn
• hard
• more

Comments

10^14 < a(19) <= 4143680790926400. a(20) <= 203947076025000000. a(21) <= 56720592225000000. a(22) <= 6936693633907329600. [Donovan Johnson, May 30 2010]

Crossrefs

Cf. A078359.

Formula

a(3) = 1737 because 1737 = 3^2 + 12^3 = 35^2 + 8^3 = 39^2 + 6^3.

Extensions

a(14)-a(18) from Donovan Johnson, May 30 2010