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In this paper we derive an explicit formula for the number of representationsof an integer by the sextenary form x^2+y^2+z^2+ 7s^2+7t^2+ 7u^2. We establishthe following intriguing inequalities 2b(n)>=a_7(n)>=b(n) for n not equal to0,2,6,16.  Here a_7(n) is the number of partitions of n that are 7-cores and b(n) is thenumber of representations of n+2 by the sextenary form (x ^2+ y ^2+z ^2+ 7s ^2+ 7t ^2+ 7u^2)/8 with x,y,z,s,t and u being odd.

On the representations of integers by the sextenary quadratic form x^2+y^2+z^2+ 7s^2+7t^2+ 7u^2 and 7-cores