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

1,1

Comments

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

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Cf. A000396, A003415, A061652.

Sequence in context: A244836 A076389 A342896 * A210101 A156372 A064241

Adjacent sequences: A189407 A189408 A189409 * A189411 A189412 A189413

Keyword

nonn

Author

Giorgio Balzarotti, Apr 21 2011

Status

approved