

A227214


Generalized Markoff numbers: largest of 7tuple of positive numbers 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.


0



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

1,2


COMMENTS

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


LINKS

Table of n, a(n) for n=1..24.


EXAMPLE

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
Sequence in context: A274997 A015551 A291018 * A049685 A196954 A122371
Adjacent sequences: A227211 A227212 A227213 * A227215 A227216 A227217


KEYWORD

nonn


AUTHOR

Shanzhen Gao, Sep 19 2013


STATUS

approved



