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A152922
a(n) = 2^(2*p-1)/4, where p is A000043(n).
4
2, 8, 128, 2048, 8388608, 2147483648, 34359738368, 576460752303423488, 664613997892457936451903530140172288, 47890485652059026823698344598447161988085597568237568
OFFSET
1,1
COMMENTS
Ultraperfect numbers (A139306), divided by 4.
LINKS
FORMULA
a(n) = A139306(n)/4 = A152921(n)/2.
MATHEMATICA
2^(2 * MersennePrimeExponent[Range[10]] - 3) (* Amiram Eldar, Oct 17 2024 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Omar E. Pol, Dec 15 2008
EXTENSIONS
a(9)-a(10) from Amiram Eldar, Oct 17 2024
STATUS
approved