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A051612 sigma(n) - phi(n). 13
0, 2, 2, 5, 2, 10, 2, 11, 7, 14, 2, 24, 2, 18, 16, 23, 2, 33, 2, 34, 20, 26, 2, 52, 11, 30, 22, 44, 2, 64, 2, 47, 28, 38, 24, 79, 2, 42, 32, 74, 2, 84, 2, 64, 54, 50, 2, 108, 15, 73, 40, 74, 2, 102, 32, 96, 44, 62, 2, 152, 2, 66, 68, 95, 36, 124, 2, 94, 52, 120, 2, 171, 2, 78 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

LINKS

T. D. Noe, Table of n, a(n) for n=1..1000

EXAMPLE

sigma(4) = 7, phi(4)=2, so a(2)=7-2=5.

a(4) = sigma(4) - phi(4) = 7-2 = 5.

CROSSREFS

Cf. A000010, A000203.

Cf. A110085, A110086, A110087.

Sequence in context: A204202 A025124 A030996 * A083456 A068058 A192233

Adjacent sequences:  A051609 A051610 A051611 * A051613 A051614 A051615

KEYWORD

nonn

AUTHOR

Jud McCranie (JudMcCranie(AT)ugaalum.uga.edu)

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Last modified February 15 23:53 EST 2012. Contains 205860 sequences.