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A152923 2^(2p-1)/8, where p is A000043(n). 2

%I #2 Mar 30 2012 17:33:56

%S 1,4,64,1024,4194304,1073741824,17179869184,288230376151711744

%N 2^(2p-1)/8, where p is A000043(n).

%C Ultraperfect numbers (A139306), divided by 8.

%F a(n) = A139306(n)/8 = A152921(n)/4 = A152922(n)/2.

%Y Cf. A000043, A139292, A139306, A152921, A152922.

%K nonn

%O 1,2

%A _Omar E. Pol_, Dec 15 2008

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Last modified March 28 07:33 EDT 2024. Contains 371235 sequences. (Running on oeis4.)