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A189410
The least common multiple of a perfect number (A000396) and its arithmetic derivative (A003415).
0
30, 224, 31248, 3104896, 1648898363392, 9007070406180864, 648516009881239552, 74276402290253369241782714368, 183899464903906662846152739755417029065034185182550163456, 521712837267651850100441428388555336932039109444807734641004395552458397047586816
OFFSET
1,1
COMMENTS
The greatest common divisor of a perfect number (A000396) and its arithmetic derivative (A003415) is an even superperfect number (A061652).
EXAMPLE
A000396(2)=28, 28'= 32, lcm(28,32)=224 -> a(2)=224.
CROSSREFS
KEYWORD
nonn
AUTHOR
Giorgio Balzarotti, Apr 21 2011
STATUS
approved