A273553 Numbers n such that n! is the sum of a square and a nonnegative cube.

0, 1, 2, 4, 19, 21

Offset: 1

Author

Altug Alkan, May 25 2016

Keywords

• nonn
• more

Comments

Numbers n such that n! = x^2 + y^3 where x, y are integers and y >= 0, is soluble.

a(7) > 33. - Giovanni Resta, Jun 03 2016

Examples

			4 is a term because 4! = 4^2 + 2^3.
19 is a term because 19! = 345427200^2 + 132480^3.
21 is a term because 21! = 6389296200^2 + 2173500^3.
		

Crossrefs

Cf. A000142, A022549.