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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 April 21 22:12 EDT 2019. Contains 322328 sequences. (Running on oeis4.)