A200977 Smallest number expressible in the form a^2 + 2b^2, with positive integers a and b, in exactly n ways.

3, 27, 99, 297, 891, 1683, 8019, 5049, 18513, 15147, 649539, 31977, 314721, 136323, 166617, 95931, 10673289, 351747, 64304361, 287793, 1499553, 8450649, 127680201, 863379, 20160657, 99379467, 5979699, 5180274, 1235641473, 3165723, 50984802, 3933171

Offset: 1

Author

Zak Seidov, Nov 29 2011

Keywords

• nonn

Comments

Incidentally all terms are multiples of 3.

Examples

			3 = 1+2*1^2.
27 = 3+2*3^2 = 5^2+2*1^2.
99 = 1+2*7^2 = 7^2+2*5^2 = 9^2+2*3^2.
		

Crossrefs

Cf. A154777 (numbers of the form a^2 + 2b^2 with positive integers a, b).