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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The greatest common divisor of a perfect number (A000396) and its arithmetic derivative (A003415) is a 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: A215192 A244836 A076389 * A210101 A156372 A064241

Adjacent sequences:  A189407 A189408 A189409 * A189411 A189412 A189413

KEYWORD

nonn

AUTHOR

Giorgio Balzarotti, Apr 21 2011

STATUS

approved

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Last modified March 18 12:10 EDT 2019. Contains 321283 sequences. (Running on oeis4.)