A189410 The least common multiple of a perfect number (A000396) and its arithmetic derivative (A003415).

30, 224, 31248, 3104896, 1648898363392, 9007070406180864, 648516009881239552, 74276402290253369241782714368, 183899464903906662846152739755417029065034185182550163456, 521712837267651850100441428388555336932039109444807734641004395552458397047586816

Offset: 1

Author

Giorgio Balzarotti, Apr 21 2011

Keywords

• nonn

Comments

The greatest common divisor of a perfect number (A000396) and its arithmetic derivative (A003415) is an even superperfect number (A061652).

Examples

			A000396(2)=28, 28'= 32, lcm(28,32)=224 -> a(2)=224.
		

Crossrefs

Cf. A000396, A003415, A061652.