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A228652 Numbers n such that if an urn contains n balls, with at least one each of c colors, there is no c > 1 for which a combination of c colors exists such that it is equally probable for c balls randomly selected from the urn to all be either the same color or distinct colors. 4

%I

%S 1,2,3,5,7,15,19,27,31,47

%N Numbers n such that if an urn contains n balls, with at least one each of c colors, there is no c > 1 for which a combination of c colors exists such that it is equally probable for c balls randomly selected from the urn to all be either the same color or distinct colors.

%C Is this sequence finite and complete?

%H William Rex Marshall, <a href="/A228652/a228652.txt">Pascal program for this sequence</a>.

%o (PASCAL) See the link section.

%Y Cf. A228650, A228651, A228653.

%K nonn

%O 1,2

%A _William Rex Marshall_, Aug 29 2013

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Last modified February 25 08:21 EST 2020. Contains 332221 sequences. (Running on oeis4.)