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A067282 Numbers n such that phi(n)+phi(n+1) divides sigma(n)+sigma(n+1). 2
1, 5, 52, 55, 185, 506, 551, 590, 644, 667, 707, 2285, 2587, 2758, 7551, 10366, 11336, 11564, 11798, 12750, 16616, 16703, 16764, 17383, 18239, 24350, 24415, 26586, 33263, 35541, 40382, 63248, 76247, 76622, 92379, 95069, 97341, 106312, 111388 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Presumably the ratio (sigma(n)+sigma(n+1))/(phi(n)+phi(n+1)) can be arbitrarily large (Labos)

LINKS

Table of n, a(n) for n=1..39.

CROSSREFS

Sequence in context: A299025 A247702 A247713 * A045539 A281202 A173719

Adjacent sequences:  A067279 A067280 A067281 * A067283 A067284 A067285

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre, Feb 23 2002

EXTENSIONS

More terms from Labos Elemer, Sep 17 2004

STATUS

approved

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Last modified March 18 17:51 EDT 2019. Contains 321292 sequences. (Running on oeis4.)