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A009242 a(n) = lcm(n, sigma(n)). 4
1, 6, 12, 28, 30, 12, 56, 120, 117, 90, 132, 84, 182, 168, 120, 496, 306, 234, 380, 420, 672, 396, 552, 120, 775, 546, 1080, 56, 870, 360, 992, 2016, 528, 918, 1680, 3276, 1406, 1140, 2184, 360, 1722, 672, 1892, 924, 1170, 1656, 2256, 1488, 2793, 4650, 1224, 2548 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..52.

FORMULA

a(n) = n*A017665(n). - Enrique Pérez Herrero, Aug 25 2011

MATHEMATICA

A009242[n_]:=LCM[DivisorSigma[1, n], n]; Array[A009242, 100] (* Enrique Pérez Herrero, Aug 25 2011 *)

CROSSREFS

Cf. A017665.

Sequence in context: A057029 A036833 A249670 * A032647 A086792 A064987

Adjacent sequences:  A009239 A009240 A009241 * A009243 A009244 A009245

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified May 23 13:32 EDT 2019. Contains 323514 sequences. (Running on oeis4.)