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A152922 2^(2p-1)/4, where p is A000043(n). 2
2, 8, 128, 2048, 8388608, 2147483648, 34359738368, 576460752303423488 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Ultraperfect numbers (A139306), divided by 4.

LINKS

Table of n, a(n) for n=1..8.

FORMULA

a(n) = A139306(n)/4 = A152921(n)/2.

CROSSREFS

Cf. A000043, A139290, A139306, A152921, A152923.

Sequence in context: A081856 A038533 A139290 * A114977 A011822 A307124

Adjacent sequences:  A152919 A152920 A152921 * A152923 A152924 A152925

KEYWORD

nonn

AUTHOR

Omar E. Pol, Dec 15 2008

STATUS

approved

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Last modified June 15 17:43 EDT 2019. Contains 324142 sequences. (Running on oeis4.)