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A067706 Numbers n such that phi(sigma(n))=3*phi(n). 1
4, 12, 30, 50, 60, 90, 120, 150, 180, 200, 225, 360, 390, 444, 528, 600, 672, 700, 714, 732, 876, 1110, 1170, 1332, 1428, 1560, 1584, 1830, 1884, 1920, 1950, 2016, 2142, 2190, 2196, 2220, 2316, 2628, 2856, 3200, 3324, 3330, 3660, 3756, 4284, 4320, 4380 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..47.

CROSSREFS

Sequence in context: A296645 A280007 A061726 * A008261 A099407 A011938

Adjacent sequences:  A067703 A067704 A067705 * A067707 A067708 A067709

KEYWORD

nonn

AUTHOR

Benoit Cloitre, Feb 05 2002

STATUS

approved

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Last modified March 22 17:25 EDT 2019. Contains 321422 sequences. (Running on oeis4.)