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A152923 2^(2p-1)/8, where p is A000043(n). 2
1, 4, 64, 1024, 4194304, 1073741824, 17179869184, 288230376151711744 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Ultraperfect numbers (A139306), divided by 8.
LINKS
FORMULA
a(n) = A139306(n)/8 = A152921(n)/4 = A152922(n)/2.
CROSSREFS
Sequence in context: A154021 A013709 A139292 * A085807 A014729 A322519
KEYWORD
nonn
AUTHOR
Omar E. Pol, Dec 15 2008
STATUS
approved

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Last modified March 29 04:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)