OFFSET
1,1
COMMENTS
Ultraperfect numbers (A139306), divided by 4.
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..15
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