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A152923
2^(2p-1)/8, where p is
A000043
(n).
2
1, 4, 64, 1024, 4194304, 1073741824, 17179869184, 288230376151711744
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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 March 29 04:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)