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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
Table of n, a(n) for n=1..8.
FORMULA
a(n) = A139306(n)/8 = A152921(n)/4 = A152922(n)/2.
CROSSREFS
Cf. A000043, A139292, A139306, A152921, A152922.
Sequence in context: A154021 A013709 A139292 * A085807 A014729 A322519
Adjacent sequences: A152920 A152921 A152922 * A152924 A152925 A152926
KEYWORD
nonn
AUTHOR
Omar E. Pol, Dec 15 2008
STATUS
approved

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Last modified May 19 14:17 EDT 2024. Contains 372697 sequences. (Running on oeis4.)