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A019438
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Squarefree orders of elements of Mathieu group M_23.
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0
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OFFSET
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0,2
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COMMENTS
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Numbers having a unique partition into four nonnegative squares. Let r=2, 6, or 14. Then the numbers r*4^k also have unique partitions into the four nonnegative squares for k>0. See A006431. - T. D. Noe, Aug 10 2005
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LINKS
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CROSSREFS
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KEYWORD
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nonn,fini,full
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AUTHOR
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STATUS
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approved
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