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A069915 Sum of (1+phi)-divisors of n (cf. A061389). 1
1, 3, 4, 3, 6, 12, 8, 7, 4, 18, 12, 12, 14, 24, 24, 11, 18, 12, 20, 18, 32, 36, 24, 28, 6, 42, 13, 24, 30, 72, 32, 31, 48, 54, 48, 12, 38, 60, 56, 42, 42, 96, 44, 36, 24, 72, 48, 44, 8, 18, 72, 42, 54, 39, 72, 56, 80, 90, 60, 72, 62, 96, 32, 35, 84, 144, 68, 54, 96, 144, 72 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

FORMULA

Multiplicative with a(p^e) = 1+Sum_{k=1..e, gcd(k, e)=1} p^k.

CROSSREFS

Cf. A061389.

Sequence in context: A046897 A109506 A000113 * A033634 A111970 A141730

Adjacent sequences:  A069912 A069913 A069914 * A069916 A069917 A069918

KEYWORD

mult,nonn

AUTHOR

Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 23 2002

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Last modified February 17 16:00 EST 2012. Contains 206050 sequences.