A227214 Generalized Markoff numbers: largest of 7-tuple of positive numbers a, b, c, d, e, f, g satisfying the Markoff(7) equation a^2+b^2+c^2+d^2+e^2+f^2+g^2 = 7abcdefg.

1, 6, 41, 281, 1721, 1926, 13201, 72241, 80646, 90481, 493921, 620166, 2963561, 3032401, 3788441, 4250681, 23145121, 29134601, 127288601, 141753606, 158630641, 177975881, 199691526, 870287321

Offset: 1

Author

Shanzhen Gao, Sep 19 2013

Keywords

• nonn
• more

Comments

For n = 1, 2, 3, 4, 6, 7, 10, 12, 16, 18, 23, a(n) is in A049685.

Examples

			a(1)=1 and a(2)=6 since (1, 1, 1, 1, 1, 1, 1) and (6, 1, 1, 1, 1, 1, 1) satisfying a^2+b^2+c^2+d^2+e^2+f^2+g^2=7abcdefg.
		

Crossrefs

Cf. A049685, A000032.

Cf. A227210, A227211, A227212.