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A067704 Numbers n such that phi(sigma(n))=2*phi(n). 4
2, 6, 8, 9, 24, 28, 70, 78, 128, 140, 222, 234, 280, 312, 350, 366, 384, 438, 496, 525, 666, 864, 888, 910, 918, 936, 942, 1036, 1098, 1158, 1232, 1314, 1400, 1464, 1575, 1662, 1708, 1752, 1824, 1836, 1878, 1900, 1938, 2044, 2382, 2480, 2526, 2590, 2664 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

LINKS

M. F. Hasler, Table of n, a(n) for n=1,...,110.

CROSSREFS

Cf. A137815, A137816.

Sequence in context: A172209 A107737 A045138 * A192125 A166270 A129459

Adjacent sequences:  A067701 A067702 A067703 * A067705 A067706 A067707

KEYWORD

nonn

AUTHOR

Benoit Cloitre (benoit7848c(AT)orange.fr), Feb 05 2002

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Last modified February 13 20:26 EST 2012. Contains 205553 sequences.