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A067192 Composite n such that sigma(n)==2 (mod phi(n)). 0
10, 20, 52, 232, 976, 1332, 65152, 261376, 4191232, 67096576, 274877120512 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(12) > 10^12. 4398043365376, 70368731594752 and 72057593635274752 are also terms. - Donovan Johnson, Feb 29 2012

LINKS

Table of n, a(n) for n=1..11.

CROSSREFS

Sequence in context: A205879 A254030 A188896 * A030004 A271512 A294473

Adjacent sequences:  A067189 A067190 A067191 * A067193 A067194 A067195

KEYWORD

nonn

AUTHOR

Benoit Cloitre, Feb 19 2002

EXTENSIONS

a(8)-a(10) from Donovan Johnson, Dec 14 2009

a(11) from Donovan Johnson, Feb 29 2012

STATUS

approved

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Last modified July 19 08:23 EDT 2019. Contains 325155 sequences. (Running on oeis4.)