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A133052
Cubes of perfect numbers.
0
216, 21952, 122023936, 536971313152, 37765098493683020333056, 633810793114959508165535727616, 2596133574015276570584768736919552, 12259964309800138562370625617974597033693433427658801152
OFFSET
1,1
FORMULA
a(n) = A000396(n)^3
EXAMPLE
a(2)=21952 because the second perfect number is 28 and 28^3=21952.
MATHEMATICA
Select[Range[9*10^5], DivisorSigma[1, #] == 2*# &]^3 (* G. C. Greubel, Oct 03 2017 *)
CROSSREFS
Cf. A000578, A030078. Perfect numbers: A000396.
Sequence in context: A046234 A229408 A269285 * A365629 A078204 A230466
KEYWORD
nonn
AUTHOR
Omar E. Pol, Oct 30 2007
EXTENSIONS
More terms from Olaf Voß, Feb 13 2008
STATUS
approved